World Patents Markush

WPIM (World Patents Index Markush), produced by Derwent Publications, Ltd., contains the specific and generic structure records for compounds in the patents included in Derwent Sections B (Farmdoc), C (Agdoc), and E (Chemdoc) since 1987. Sources include patents from 29 industrialized countries as well as European and PCT patents and also items from Research Disclosure and International Technology Disclosures. The compound numbers of relevant references found in WPIM can be searched in Derwent s WPI database to retrieve the corresponding bibliographic information. 

Berks AH. Current State of the Art of Markush Topological Search Systems. World Patent Inf. 2001 23(19) 5-13. A review of the databases offering topological searching of chemical structures from patents, the indexing, coverage, and searchability of the Markush structures. 

Barnard, J.M. and Wright, P.M. (2009) Towards in-house searching of Markush structures from patents. World Patent Information, 31, 97-103. 

Lynch, M.F. Generic Chemical Structures in Patents (Markush Structures) the Research Project at the University of Sheffield . World Patent Information 1986, 8, 85-91. 

Berks, H. (2001) Current state of the art of Markush topological search systems. World Patent Information, 23, 5-13. 

CAS = chemical abstracts service CDB = IFI/Plenem comprehensive code DWPI = Derwent world patents index INPI = Institut national de la propriete industrielle (the french patent office, producer of pharmsearch) MARPAT = chemical abstracts service database of Markush chemical structures from patents MDARC = Markush DARC MPHARM = pharmsearch Markush file, produced by INPI WPIM = world patents index Markush file. 

Markush DARC (MDARC) is commercially available on the Questel online system, and contains two databases World Patents Index Markush (WPIM), produced by Derwent Information, Ltd. and Markush Pharmsearch (MPHARM), produced by Institut National de la Ptopriete Industrielle (INPI, the French patent office). The initial development of MDARC was a collaboration between Questel and INPI. This development was later Joined by Derwent with commercial implementation in 1987. 

The WPIM file corresponds to Derwent World Patents Index (DWPI) online file, and therefore includes documents from all of the countries that Derwent normally covers. Indexing for WPIM began in 1987, and since 1987, Derwent has double indexed all chemical patents with both the fragmentation codes and WPIM indexing. Specific structures are indexed if they are not part of a Markush structure in the same patent document. Polymers are not indexed in detail in the WPIM database. Polypeptides of 10 or more amino acids are indexed in a separate non-Markush database and are not included in WPIM. All four online services that carry the DWPI also have the WPIM accession numbers. WPIM indexes patents from all countries in the Derwent database, but it is available to subscribers only. 

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