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No single source comes close to covering all publications available. patent or published patent application is its earliest filing date in the U. For other publications, the reference date is the publication date. will become a first-to-file country on March 16, 2013, as opposed to a first-to-invent country. S., the date of invention will be the date the applicant files a patent application.The need to conduct NPL prior art searches depends on the targeted technology and type of search. The patent invalidity search attempts to locate prior art patents or nonpatent publications that predate a critical date for the target patent. The date of a reference must precede the date of invention in order to be prior art.

Alternative terminology for these searches includes Validity Patent Search or Invalidity Patent Search.

A Patent Validity Search may be commissioned when a client is contemplating asserting, licensing, buying, or selling a patent and wants to confirm that the patent is enforceable.

Knowing whether the patent can withstand an attack on validity allows you to take a better-informed and stronger negotiating stance.

A Patent Validity Search or Patent Invalidity Search is an exhaustive Prior Art Search conducted after patent issuance.

The purpose of the search is either to validate the enforceability of a patent's claims or to invalidate one or more claims of a patent, respectively.

Prior art also includes physical embodiments of products and evidence of sale or public use. Each of these sources of prior art requires a different search approach and are more or less applicable depending on the subject area of technology.