Bill Murray wrote:
>
> Does CA not cover all US patents ? I recently looked up EP 118029 in
> the CA file and printed out the patent family to look for an english
> equivalent . No US patents were listed in the patent family listing.
> However upon going to the espacenet database I found the US equiv. to
> be US 4565216. I can only assume that CAS patent families are not
> complete. Am I correct ?
>
> Claudia Chandler
> Kvaerner Chemetics Inc
> 1818 Cornwall Avenue
> Vancouver, B.C.
> V6J 1C7
> phone 604-737-4510 fax 604-734-0340
> claudia.chandler@kvaerner.com
CA does not cover all U.S. patents, but covers most if not all chemical
topics. Although if you found the original EP in the CA file, you could
expect the U.S. equivalent there also. However, CAS has only recently
been adding equivalents to the CA file patent records and equivalents
have been added to the backfile working retrospectively. Although their
respective methods are not equally well documented, Derwent and CAS
apparently use somewhat different methods to determine equivalents -- at
least the results are sometimes different.
For patents questions at CAS, including patent subject coverage, contact
Tom Ebe.
-- Bob Buntrock
Buntrock Associates, Inc.
(usual disclaimers)
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