Validity Search (£)

A search to locate documents which might be used to invalidate an invention forming the subject of a patent claim

Report completed within 15 working days

Coverage Countries / bodies covered Price (£)
Patent Only Worldwide (PatBase records) 2,250
Patent / Non-patent As above plus technology specific databases 3,000

Publication number of patent to be invalidated, with an indication of claims / features of interest, plus any prior art (if available).


Patent: The strategy will usually be a combination of

  • Classifications (IPC, ECLA, DEKLA, USPC, CPC and / or Japanese FI / F-Terms) either via specific headings or using classes-in-combination as appropriate.
  • Keywords, “pure”’ and / or in combination with classification headings.
  • Citation searching, forward and backward.

The methods used are ultimately determined by the subject matter of the search and the constraints of the budget.

Non-patent: Primarily by keyword, although database specific classification schemes may be utilised.

Supplementary applicant / inventor / author searches may also form part of both strategies.


Patents in full text and / or abstract format are accessed through PatBase, the database developed by RWS and Minesoft covering more than 45 million patents from over 100 issuing authorities: US, WO, EP, GB, DE, FR, CN, JP and many more.

Technology-specific abstract databases will be the resource for non-patent literature. Where possible, full articles will be inspected for any abstracts of potential interest.



  • All relevant and marginal publications located with technical comments as to relevance or otherwise.
  • Patent family information, with representative abstract and image (where readily available).
  • Details of the strategy employed (periods, countries, class definitions etc.).
  • Recommendations for extension of the search (if appropriate).
  • Free patent pdf copies.
Delivery Reports delivered by email, with an ftp link to pdf copies.
Budget We can adapt the strategy to work with lower or higher budgets. See order form below.
Estimates Alternatively, an estimate for a comprehensive “no-stone-unturned” search can be provided free of charge. See order form below.

Validity Search Order Form

Key Assets

  • Over 50 years experience
  • In-house team of technically qualified multidisciplinary researchers
  • Worldwide coverage
  • Expertise in all technical areas
  • Extensive range of search tools and resources
  • ISO 9001 accredited procedures

Key Services

Patent / Design Searches:

Validity / Infringement /
Novelty / State-of-the-Art /
Structure / Sequence

Non-Patent Literature Searches

Patent / Design Watches:

Subject Matter / Class / Name / Status

Documentation Supply:

Patent Filewrappers / Non-patent Literature / Patent Status

PatBase patent database:

Available on subscription

Please click on the forms below to complete your contact and search request details.


To proceed with this order, please attach any files (if necessary) and click the submit button

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