Derwent Access

H Nohe et al. (BASF AG). German patent applications 1618078 Derwent Accession Nr 70-59855R, 1953259 (Chem Abstr 75 19798, 1971), 1953260 (Chem Abstr 75 19799, 1971). 

These contain most of the dyes and intermediates on chemistry and technology, but in general are more difficult to access than books and journals. Dyes are classified under Section E2 of Derwents Wodd Patents Index Classification. 

Derwent International Patent Family File and U.S. Patents Full Text. Derwent International Patent Family File (DIPF) [75] provides access to 20 million patents issued by 40 patent-issuing authorities, covering more than 10 million inventions as far back as 1963. The DIPF is linked to U.S. Patents Full-Text (US-PAT) [75]. US-PAT contains the full text of more than 2 million patents issued by the U.S. Patent and Trademark Office since 1976. DIPF and US-PAT are available on the commercial online service Westlaw. 

The Derwent International Patent Family on Westlaw, [Internet], URL http //store.westgroup.com/doc-umentation/westlaw/wlawdoc/wlres/drwentOl. pdf, accessed 3-14-2001. 

Derwent World Patents Index, Thomson Scientific, The Thomson Corporation http // scientific.thomson.com/products/dwpi/ (accessed December 23, 2007). 

Derwent Information, Frequently asked questions, http //www.derwent.com/. Accessed December 31, 2002. 

Delphion, www.delphion.com/ (accessed August 9,2010). Owned by Thomson Reuters, this subscription service provides full text searching, large file export, and many data analysis tools for intemational patents. It can search a number of available international patent collections and includes the Derwent World Patents Index, one of the oldest online patent services with access to 18.25 million inventions from 41 different intemational patent issuing authorities. ... 

Soai K, Shibata T, Kobata Y (1997) (Japan Kokai Tokkyo Koho) JP 1997 9-268179. Application date February 1 and April 18, 1996. An abstract of JP9-268179 is readily available liom the European Patent Office (http //ep.espacenet.com) and, as JP-09268179 A, liom Derwent World Patent Index, update No. 51 of 1997 (accession no. 1997-554699)... 

In order to access the Derwent fragmentation code, and also to access Derwent documentation abstracts with detailed Markush and chemical summaries, it is necessary to be a Derwent subscriber. Derwent subscriptions are widespread among corporations in North America, Europe, and Japan. The Derwent fragmentation data is not available to academic institutions or other nonsubscribers at this time. 

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. 

Secondly, chemical IR may be thought of as a specialized index into the scientific and patent literature, with the chemical structure representing an extremely condensed abstract of the journal article or patent document. In this sense, the structures are not stored for their intrinsic interest, but as pointers to other documents, some of which, for example, may be related to their synthesis, physicochemical properties and numeric data, or applications. This is the sense in which a few data vendors supply chemical and reaction databases (Derwent and Institute for Scientific Information), and the alternate sense in which the CAS databases may be used. The use of CIR systems in synthesis design - providing access, for example, to databases of reagents or starting materials, or of name reactions - provides a crucial tool for the contemporary chemical and pharmaceutical industry. 

Derwent not only contains the basic patent, like Chemical Abstracts do, but in addition patent families from the countries covered by Derwent (Fig. 131). Chemical Abstracts Service also contains patent families with the limitation that they are only accessable in the printed version (Sect. 2.1.3.6) but not in the database. Other databases offering information concerning patent families are INPADOC and EDOC (Questel). 

There is a gateway to QUESTEL, making the Derwent file for Markush structures, Markush Dare, accessible to the searcher (Sect. 7.8). 

TOPER AG (the Topological Fragment Code Generator program for chemical structure access to the Derwent patents data base) (26). 

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