When a product launch, licensing agreement or business strategy is threatened by a patent dispute, it becomes a matter of urgency. One major issue that has to be addressed in a patent infringement action in the United States is whether the patent in issue can be subjected to closer scrutiny of its technical history. An invalidity search can be performed to investigate this aspect; it will include looking at earlier patents, published research and other evidence that can impact on the scope of validity of specific patent claims.
The aim is not just to gain documents similar to an invention. It's about locating the evidence, analysing the evidence and understanding what it actually reveals, and how the evidence may help in a legal challenge. Understanding the nature of this research informs business owners, legal professionals, and tech companies prior to investing too much into an argument.
What Makes a Patent Claim Vulnerable?
Claims define an invention and are protected by a patent. These claims are more important than a general product description as they identify the features for which protection is desired. Two products can do the same thing in different ways, and a "dusty" document might contain a feature that is important when read more carefully.
Prior art may be considered novelty under 35 U.S.C. § 102 and/or obviousness under 35 U.S.C. § 103 under U.S. patent law. A prior reference may reveal the claimed invention or several prior references may be applicable to determining whether the claimed invention would have been obvious to a person of ordinary skill in the art.
But, the presence of an older document does not negate the validity of a patent. The date, technical aspects, association with the claim language and the applicable law are all relevant. Searching is a useful process and is not a simple matching of keywords.
Where Should Patent Research Begin?
Imagine the claims of a patent and identify the technological features of the invention. Patent specifications, cited documents, prosecution histories and related applications give you an idea about research avenues.
References may include USPTO patent database Google patents, scientific journals, conference papers, engineering books or even old technical books, depending on the technology. For inventions related to software, prior technical literature may be relevant. Prior art in medical devices can include prior designs or engineering literature.
Special attention is needed for dates. A document's publication date and a patent's earliest claimed priority date are not necessarily interchangeable. The question of whether a reference is considered to constitute prior art hinges upon the facts and legal principles involved. The rules may be applicable to a particular dispute and patent counsel can assist in determining how they are to be applied.
Why Relevant Evidence Matters More Than Search Volume
It is not helpful to have hundreds of search hits when conducting a patent search. A few of the more technically relevant references can be much more useful than many that all have a handful of keywords in common.
A directed invalidity search is a search that is performed in order to compare potential references to the actual claims of the patent. Researchers can create claim charts that link specific passages, diagrams and technical disclosures to individual claim elements. This aids legal practitioners identification of supporting evidence, missing evidence and areas where further research is needed.
What's also an issue: Words. Different engineers may use different words to convey the same thing, and in older papers for a technology that isn't widespread now, there may be different words used to describe the same thing. Leverage synonyms and then patent class code, inventor name and cited references from documents you care about for data in addition to the exact phrase search.
Common Mistakes That Can Weaken a Patent Challenge
There are a few common errors that can be time-consuming and lead to erroneous results:
Looking for phrase-only: Older technical documents may have different terms.
Failure to consider relevant dates: A document can be a prior art that is not covered by the relevant rule(s).
Failure to demonstrate invalidity due to similarity of product: The similarity of function is not a sufficient basis for finding a patent claim invalid.
Claim limitations that are overlooked: They may be important features in a reference, but they are not mentioned in the claim.
Too late: Court schedules and litigative deadlines might not allow for more thorough investigation.
One advantage to early planning is in U.S. patent litigation where time requirements and court rules can impact time for research. If you start off early, you will have more time to check references, explore other search terms and consider complex technical questions.
How Businesses Can Use Search Findings
Patent research can be helpful to a company in determining possible legal arguments, licensing negotiations, commercial risks, or product design changes. At times the evidence might show that a proposed challenge is less powerful than anticipated. If that limitation can be identified early, it can save a business resources to invest in an unsupported position.
Businesses should keep copies of relevant documents, publication information, dates and source information. It can be difficult to determine the date at which a technical manual, archived web page, or conference paper was made publicly available if the information is not recorded correctly.
Research services like those offered by Citius Minds can be helpful in patent searches, prior art searches and technical analysis. Their results can then assist the attorneys with analyzing the evidence while professional patent lawyers can evaluate the legal consequences as well as the strategy to take.
Make the Evidence Serve the Right Decision
An invalidity search ought to be conducted in light of credible evidence, rather than just to reinforce an opinion. Prior to hiring one, determine the disputed claims, relevant technologies, references to be known and upcoming deadlines. Avoiding duplication of effort by sharing previous research is also a possibility.
A long list of documents is not necessarily the most useful result. It is a clear understanding of the evidence that can be established, evidence that is not clear, and questions that will have to be answered by the application of legal judgment before a business makes its next move.
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