Derwent World Patents

Derwent World Patents Index. Derwent World Patents Index (DWPI) [76] is a comprehensive database of patent documents published worldwide. It covers over 10 million separate inventions from more than 20 million basic and equivalent patent documents. DWPI is commercially available on the following online services DIALOG, Questel, Orbit, and STN. Pharmaceuticals from 1963, agricultural and veterinary medicine from 1965, plastics and polymers from 1966, all chemistry from 1970, electronics, electrical and mechanical engineering from 1974, and comprehensive coverage of all... 

Derwent World Patents Index, [Internet]. URL http // www.derwent.com/, accessed 7-20-2000. 

CHEMDOC code, 18 242. See also FARMDOC service Derwent World Patents Index (WPI),... 

The pipeline of innovation, expressed in filed patents, has also changed. The Derwent World Patent Index shows that the number of patents in the world nearly tripled to 710,000/year between 1980 and 2004, whereas in the chemical industry it only doubled to 213,000/year. Since 1992, the number of patents in the chemical industry has been steady. 

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

Derwent World Patents Index—references to patents, including chemical structure and use patents... 

Organosilicon Patents issued 1953 - 2003. Source Dow Coming Corporation internal collection (1953 - 1973), Derwent World Patent Index search for Si patent families (1974 - present). 

Derwent Guide to Patent Expiries. 9th ed. London Thomson Derwent, 2004. A collection of short siunmaries of the patent terms and legislation of coimtries covered by the Derwent World Patents Index (DWPI) and INPADOC, republished frequently as a bound volume and updated on the Derwent Web site (http //www.derwent.com). 

The choice of date range is arbitrary. The number of journal articles for each year was obtained from a search of electronic version of English-based polymer and polymer-related journals using the keywords polyolefin and blends. Within polyolefin keyword, the subkeywords used in the search were polyethylene (PE, LLDPE, LDPE, HDPE, UHMWPE, PE, etc.), polypropylene (PP, iPP, sPP, aPP, etc.), polybutene-1, poly-4-methylpentene-l, ethylene-diene monomer, ethylene-propylene-diene terpolymer, ethylene propylene rubber, thermoplastic olefins, natural rubber (NR), polybutadiene, polyisobutylene (PIB), polyisoprene, and polyolefin elastomer. For the polyolefin blends patent search, polymer indexing codes and manual codes were used to search for the patents in Derwent World Patent Index based on the above keywords listed in the search strategy. 

The literature to be reviewed was taken from searches on a number of online databases, including Chemical Abstracts, Derwent World Patent Index, European Patents Online, and the full text U.S. Patent database." The author has endeavored to encompass all the literature at least to the end of 1998. 

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)... 

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. 

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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