Patent application

Patent application

A patent application is a request pending at a patent office for the grant of a patent for the invention described and claimed by that application. An application consists of a description of the invention (the "patent specification"), together with official forms and correspondence relating to the application. The term patent application is also used to refer to the process of applying for a patent, or to the patent specification itself (i.e. the content of the document filed with a view to initiating the process of applying for a patent ).

In order to obtain the grant of a patent, a person, either legal or natural, must file an application at a patent office with jurisdiction to grant a patent in the geographic area over which coverage is required. This will often be a national patent office but could be a regional body, such as the European Patent Office. Once the patent specification complies with the laws of the office concerned, a patent may be granted for the invention described and claimed by the specification.

The process of "negotiating" or "arguing" with a patent office for the grant of a patent, and interaction with a patent office with regard to a patent after its grant, is known as patent prosecution. Patent prosecution is distinct from patent litigation which relates to legal proceedings for infringement of a patent after it is granted.


As pointed out by Peter Prescott QC, the expression "patent application" is ambiguous. [ "Oxonica Energy Ltd v Neuftec Ltd (2008) EWHC 2127 (Pat)"] , item 43. ] It can bear two different meanings:

# The legal state of affairs that is constituted when a person requests the competent authority to grant him a patent and that request is still outstanding.
# The content of the document or documents which that person filed with a view to initiating the above; most pertinently, a description of the invention together with at least one claim purporting to define it.

The first of those – the request for a legal privilege to which you will be entitled if your application be well founded – is an institutional fact, and is temporal by its very nature. It ceases to exist as soon as your application is withdrawn, is refused, or is granted. The second of those, the informational content of the document as filed (or in other, prosaic words, the piece of paper), is a historical fact that never goes away, no matter what the Patent Office does, or anyone else does. It exists in perpetuity. [ Some of the early patents issued by the United States Patent and Trademark Office from July 1790 (when the first U.S. patent was issued) to July 1836 were however lost in a disastrous fire on December 15, 1836. The information content of at least some of these patent documents (if not recovered from somewhere else, e.g. through the inventors' records) will not exist in perpetuity. See X-patents. ] The expression "application" is often employed without being conscious of its ambiguity. [ "Oxonica Energy Ltd v Neuftec Ltd (2008) EWHC 2127 (Pat)"] , item 44. Some examples of confusion in the United Kingdom Patents Act 1977 are given in this decision. ] The expression is capable of misleading even experienced professionals.

National, regional and international applications

Depending upon the office at which a patent application is filed, that application could either be an application for a patent in a given country, or may be an application for a patent in a range of countries. The former are known as "national (patent) applications", and the latter as "regional (patent) applications".

National applications

National applications are generally filed at a national patent office, such as the United Kingdom Patent Office, to obtain a patent in the country of that office. The application may either be filed directly at that office, or may result from a regional application or from an international application under the Patent Cooperation Treaty (PCT), once it enters the "national phase".

Regional applications

A regional patent application is one which may have effect in a range of countries. The European Patent Office (EPO) is an example of a Regional patent office. The EPO grants patents which can take effect in some or all countries contracting to the European Patent Convention (EPC), following a single application process.

Filing and prosecuting an application at a regional granting office is advantageous as it allows patents in a number of countries to be obtained without having to prosecute applications in all of those countries. The cost and complexity of obtaining protection is therefore reduced.

International applications (under the Patent Cooperation Treaty)

The Patent Cooperation Treaty (PCT) is operated by World Intellectual Property Organization (WIPO) and provides a centralised application process, but patents are not granted under the treaty.

The PCT system enables an applicant to file a single patent application in a single language. The application, called an international application, can, at a later date, lead to the grant of a patent in any of the states contracting to the PCT. WIPO, or more precisely the International Bureau of WIPO, performs many of the formalities of a patent application in a centralised manner, therefore avoiding the need to repeat the steps in all countries in which a patent may ultimately be granted. The WIPO coordinates searches performed by any one of the International Searching Authorities (ISA), publishes the international applications and coordinates preliminary examination performed by any one of the International Preliminary Examination Authorities (IPEA). Steps such as naming inventors and applicants, and filing certified copies of priority documents can also be done centrally, and need not be repeated.

The main advantage of proceeding via the PCT route is that the option of obtaining patents in a wide range of countries is retained, while the cost of a large number of applications is deferred.

Types of applications

Patent offices may define a number of types of applications, each offering different benefits and being useful in different situations. Each office utilises different names for the types of applications, but the general groups are detailed below. Within each group there are specific type of applications, such as utility patents, plant patents, and design patents, each of which can have their own substantive and procedural rules.

tandard application

A standard patent application is a patent application containing all of the necessary parts (e.g. a written description of the invention and claims) that are required for the grant of a patent. A standard patent may or may not result in the grant of a patent depending upon the outcome of an examination by the patent office it is filed in. In the U.S., a standard patent application is referred to as a "non-provisional" application.

Provisional applications

Provisional patent applications can be filed at many patent offices, such as the USPTO in the United States of America. A provisional application provides the opportunity to place an application on file to obtain a filing date (thereby securing a priority date), but without the expense and complexity of a standard patent application. The disclosure in a provisional application may, within a limited time (one year in the US), be incorporated into a standard patent application if a patent is to be pursued. Otherwise, the provisional application expires. No enforceable rights can be obtained solely through the filing of a provisional application.

Continuation applications

In certain offices a patent application can be filed as a continuation of a previous application. Such an application is a convenient method of including material from a previous application in a new application when the priority year has expired and further refinement is needed. Various types of continuation application are possible, such as "continuation" and "continuation-in-part".

Divisional applications

A divisional application is one which has been "divided" from an existing application. A divisional application can only contain subject matter in the application from which it is divided (its "parent"), but retains the filing and priority date of that parent. A divisional application is useful if a unity of invention objection is issued, in which case the second (and third, fourth, etc) inventions can be protected in divisional applications.

Application preparation, filing and prosecution

The process of obtaining the grant of a patent begins with the preparation of a specification describing the invention. That specification is filed at a patent office for examination and ultimately a patent for the invention described in the application is either granted or refused.

Patent specification

A patent specification is a document describing the invention for which a patent is sought and setting out the scope of the protection of the patent. As such, a specification generally contains a section detailing the background and overview of the invention, a description of the invention and embodiments of the invention and claims, which set out the scope of the protection. A specification may include figures to aid the description of the invention, gene sequences and references to biological deposits, or computer code, depending upon the subject matter of the application. Most patent offices also require that the application includes an abstract which provides a summary of the invention to aid searching. A title must also generally be provided for the application.

Each patent office has rules relating to the form of the specification, defining such things as paper size, font, layout, section ordering and headings. Such requirements vary between offices.

A description cannot generally be modified once it is filed (with narrow exceptions), so it is important to have it done correctly the first time.


The claims of a patent specification define the scope of protection of a patent granted by the patent. The claims describe the invention in a specific legal style, setting out the essential features of the invention in a manner to clearly define what will infringe the patent. Claims are often amended during prosecution to narrow or expand their scope.

The claims may contain one or more hierarchical sets of claims, each having one or more main, independent claim setting out the broadest protection, and a number of dependent claims which narrow that protection by defining more specific features of the invention.

In the U.S., claims can be amended after a patent is granted, but their scope cannot be broadened beyond what was originally disclosed in the specification. No claim broadening is allowed more than two years after the patent issues.

Filing date

The filing date of an application is important as it sets a cutoff date after which any public disclosures will not form prior art (but the priority date must also be considered), and also because, in most jurisdictions (notably, not the USA) the right to a patent for an invention lies with the first person to file an application for protection of that invention (See: First to file and first to invent). It is therefore generally beneficial to file an application as soon as possible.

In order to obtain a filing date the documents filed must comply with the regulations of the patent office in which it was filed. A full specification complying with all rules may not be required to obtain a filing date, for example in the United Kingdom, claims and an abstract are not required to obtain a filing date, but can be added later. However, no subject matter can be added to an application after the filing date and so it is vital that an application discloses all material relevant to the application at the time of filing. If the requirements for the award of a filing date are not met, the Patent Office will notify the Applicant of the deficiencies. Depending upon the law of the patent office in question, correction may be possible without moving the filing date, or the application may be awarded a filing date adjusted to the date on which the requirements are completed.

A filed patent application generally receives a so-called application number.

Priority claim

A patent application may make a claim to priority from another previously filed application, in order to take advantage of the filing date of information disclosed in that earlier application. Claiming priority is desirable because the earlier effective filing date reduces the number of prior art disclosures, increasing the likelihood of obtaining a patent.

The priority system is principally useful in filing patent applications in many countries, as the cost of the filings can be delayed by up to a year, without any of the applications made earlier for the same invention counting against later applications.

The rules relating to priority claims are derived from the Paris Convention for the Protection of Industrial Property and countries which provide a priority system in conformity with the Paris convention are said to be "convention countries". These should not be confused with the rules under the Patent Cooperation Treaty (PCT), outlined above.

ecurity issues

Many national patent offices require that security clearance is given prior to the filing of a patent application in foreign countries. Such clearance is intended to protect national security by preventing the spread and publication of technologies related to (amongst others) warfare or nuclear arms.

The rules vary between patent offices, but in general all applications filed are reviewed and if they contain any relevant material, a secrecy order may be imposed. That order may prevent the publication of the application, and/or the foreign filing of patents relating to the invention.

Should it be desired to file an application in a country other than an inventor's country of residence, it may be necessary to obtain a foreign filing licence from the inventor's national patent office to permit filing abroad. Some offices, such as the USPTO, may grant an automatic license after a specified time (e.g., 6 months), if a secrecy order is not issued in that time.

Anyone working on government contracts involving national security technologies would be well advised to carefully coordinate patent applications with the relevant agencies. Similarly, patent applicants should be aware of the arms export-control laws that may restrict the types of technical information that can be disclosed to any foreign nationals.


Patent applications are generally published 18 months after the earliest priority date of the application. Prior to that publication the application is confidential to the patent office. After publication, depending upon local rules, certain parts of the application file may remain confidential, but it is common for all communications between an Applicant (or his agent) and the patent office to be publicly available.

The publication of a patent application marks the date at which it is publicly available and therefore at which it forms full prior art for other patent applications worldwide.

Patent pending

Patent pending is a term used to describe an alleged invention that is the subject of a patent application. The term may be used to mark products containing the invention to draw competitor's attention to the fact that they may be infringing a patent if the product is copied after the patent is granted. The rules relating to the use of the term to mark products vary between patent offices, as do the benefits of such marking. In general, it is permissible to apply the term patent pending to a product if there is, in fact, a patent pending for any invention implemented in the product.

Patentable subject matter

Patents are granted for the protection of an invention, but while an invention may occur in any field, patent laws have restrictions on the areas in which patents can be granted. These are known as "exclusions from patentability".

In the USA the scope of patentable subject is significantly larger than in, for example, Europe, where there are exclusions for such things as computer software and methods of performing mental acts. The subject of what should be patentable is highly contentious, in particular whether software and business methods should be patentable.

earch and examination

After filing, either systematically or, in some jurisdictions, upon request, a search is carried out for the patent application. The function of the search is to reveal prior art which may be relevant to the patentability of the alleged invention (that is, relevant to what is claimed, the "claimed subject-matter"). The search report is published, generally with the application 18 months after the priority date of the application, and as such is a public document. The search report is useful to the applicant to determine whether the application should be pursued or if there is prior art that prevents the grant of a useful patent, in which case the application may be abandoned before incurring further expense. The search report is also useful for the public and the competitors to enable them to gain an idea of the scope of any protection that might be granted based on the pending patent application. [ Board of Appeal of the EPO, [ "Decision of Technical Board of Appeal 3.5.01 dated 20 October 2006 T 1242/04 – 3.5.01"] , Reasons 8.2, OJ EPO 7/2007, p. 421 ]

Some jurisdictions, for example the USA, do not conduct a separate search, but rather search and examination are combined. In that case, a separate search report is not issued and it is not until the application is examined that the applicant is informed of prior art that the patent office examiner considers relevant.

Examination is the process of ensuring an application complies with the requirements of the relevant patent laws. Examination is generally an iterative process, in which the patent office writes to the applicant (see Office action) notifying him/her of its objections to which the applicant responds with arguments and/or amendments to overcome the objections. Amendments and arguments may then be accepted or rejected, triggering further response, and so forth, until a patent is issued or the application is abandoned.

Issue or grant

Once the patent application complies with the requirements of the relevant Patent Office, a patent will be granted further official fees, and in some regional patent systems, such as the European patent system, translations of the application into the official languages of the states in which protection is desired must be filed to validate the patent.

The date of issue effectively terminates prosecution of a specific application, after which continuing applications cannot be filed, and establishes the date upon which infringement may be charged. Furthermore, an issue date for a USA application filed prior to 1995 also factors into the term of the patent, whereas the term of later filings is determined solely by the filing date.

Post-issue or grant

Many jurisdictions require periodic payment of maintenance fees in order to retain the validity of a patent after it is issued and during its term. Failure to timely pay the fees results in loss of the patent's protection.

The validity of an issued patent may also be subject to post-issue challenges of various types, some of which may cause the patent office to re-examine the application.

References and notes

See also

*Claim (patent)
*List of patent legal concepts
*List of patent offices
*INID codes
*Patent infringement
*Provisional application
*Provisional rights
*Unity of invention
*Statutory invention registration

Further reading

* Eugenio Archontopoulos, Dominique Guellec, Niels Stevnsborg, Bruno van Pottelsberghe de la Potterie, Nicolas van Zeebroeck, [ "When small is beautiful: measuring the evolution and consequences of the voluminosity of patent applications at the EPO"] , 2006, No 06-019.RS, Working Papers CEB from Université Libre de Bruxelles, Solvay Business School, Centre Emile Bernheim (CEB) (pdf)

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