Computer-based patent searches: Using the IPC or free text?

Hanns Bechtel

World Patent Information, 1981, vol. 3, issue 2, 61-67

Abstract: Documentary indications of the British patent specification 14 79 444 are traced through various machine-readable stores (OTAF, DERWENT, CASEARCH, CLAIMS/US) and various printed collections (claims of German Offenlegungsschriften, US and GB abstracts and Chemical Abstracts). The traceability of patents such as GB 14 79 444 (electrolytic cell with diaphragm and titanium anodes with a catalytically active coating of platinum or ruthenium and their compounds) using the IPC and free text terms is compared. Symptomatically, it was found that free text searches go further than IPC searches, because they can reach a greater search depth.

Date: 1981
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