World Patents Index from Derwent

The World Patents Index is the world s largest patent abstracting database. It is produced by the London based publishing house Derwent, which started a compilation of patents in 1963. In the beginning it confined itself to the fields of pharmacy, agrochemistry and veterinary science. The following breakdown shows the chronological development and the sciences covered by Derwent s World Patents Index  

Altogether, approximately 50% of all the patents are based in chemistry, pharmacy and neighbouring fields. Derwent excerpts patents from 30 countries and two international patent organizations. Like Chemical Abstracts Service, but unlike almost all other patent databases, Derwent writes own titles and abstracts. This abstract is worked out on the basis of the abstract contained in the patent itself as well as relating claims and descriptions. Sometimes it is possible to get more than one abstract. 

It is often said that Chemical Abstracts and Derwent overlap. Table 15 shows a comparison of countries and time periods studied by both Chemical Abstracts and Derwent to illustrate that there are indeed differences in the coverage of facts, both historically and geographically. 

Although there are overlaps one should not speak of duplicates, but of mutual supplementary information. Derwent s patent abstracts are more application orientated, while Chemical Abstracts is fact-orientated. Derwent abstracts contain a paragraph Use/Advantage. 

Derwent provides an excellent supplement to the information given by Chemical Abstracts when discussing neighbor fields of chemistry, since Derwent provides all technology-related information since 1974/1975. A detailed index on IPC classes covered by CAS can be drawn from the manual Patent Information from Chemical Abstracts Service - Coverage and Content. 

---

The World Patent Index of Derwent Information Ltd. is a broad collection of international value-added patent documents from 40 patent-issuing authorities. The bibliographic database contains 11.6 million patent records with 5.5 million images (October, 2002) and grows by 1.5 million patent documents each year. The classified and indexed documents (since 1963) are sometimes provided wdth additional abstracts or significant titles. 

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... 

World Patents Index. WPI, produced by Derwent Publications, Ltd., contains records of patent publications from 32 issuing authorities around the world. Since 1970, all chemical technologies are included. Prior to then, content varies as follows polymers from 1966, agricultural chemicals from 1965, and pharmaceuticals from 1963. Records contain bibliographic data and an abstract, which describes the novel features of the patent. The patent tides and abstracts in WPI are created by Derwent and generally give a more definitive description of the patent s content than the title and abstract, which appear on the document itself Records also list equivalent or family member patents that have been identified as covering the same or related invention(s) (92). 

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. 

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. ... 

Recently, a series of chemical substances called functional dyes have attracted considerable attention. Because such dyes have long conjugated pi-electron systems and in many cases possess intramolecular charge transfer structures, functional dyes are expected to show interesting optical and electronic properties. Among functional dyes, phthalocyanine compounds have been extensively investigated because of their excellent physical, chemical and coloristic properties, as mentioned above. For example, about 1000 related US patents, published from 1990 onwards, are retrievable from the World Patent Index data base of Derwent, and more than 30 % of these are classified in such non-colorant applications as electrophotography, catalysis, and infrared radiation absorption. 

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. 

---