Chemical Abstracts Patents abstracted

CASREACT (Chemical Abstracts Reaction Search Service) is a reaction database started in 1985 with more than 6.7 million reactions (3 million single-step and 3.7 million multi-step reactions) (March, 2003) derived from 400 000 documents (journals, patents, etc.). The records contain the following information ... 

CA FUe Chemical Abstracts Service biochemistry, chemistry, and chemical engineering bibho. >21mio substances >25mio sequences 9000 journals, 37 patent offices, proceedings, books STN commercial CD-ROM, online weekly www.cas.org... 

CASREACT Chemical Abstracts Service chemical reactions biblio., reaction, struc- ture >400 000 documents >6.6 mio reactions journals, patents STN commercial CD-ROM, online weekly WUW.CflS.OTg... 

There is growing commercial importance and escalating scientific interest in PVDF. The World Patent database, including the United States, Hsts 678 patents that cite the term poly(vinyHdene fluoride) for the period 1963—1980 and 2052 patents for the period 1981—1992 Chemical Abstracts files covering the years 1967—1992 contain 5282 references for the same term. Thirty years ago there was only one commercial producer of PVDF in the world now there are two in the United States, two in Japan, and three in Europe. 

USPATFULL STN Chemical Abstracts Service U.S. full bibhographic data full text Chemical Abstracts indexing from U.S. patent or equivalent... 

Chemical Abstracts Service. The Chemical Abstracts Service (CAS), a division of the American Chemical Society, has produced Chemical Abstracts (CA) since 1907. Since the demise of Chemisches Zentralblatt and British Chemical Abstracts CA has been the preeminent medium for documenting new pubhcations in the field of chemistry and chemical engineering. CA documents chemical pubHcations of all types. It is not a patent database per se, but its patent component is larger than most databases devoted entirely to patents. Thus, for example, the number of patent references in CA for the years 1991—1993 ranged from 95,500—99,400 per year. 

Chemical Abstracts and GAS Registry. CAS is especially notable for the thoroughness and high quaUty of its products. The CAS Registry system does a superb job of identifying any chemical that is either involved in new chemistry with hard data, or, since about 1980, specifically claimed in a patent. The MARPAT database has also led CAS to identify the perhaps nonexistent but prophetic substances covered by Markush claims in patents. 

Chemical Abstracts Service produces the world s largest and most comprehensive databases of chemical information. Principal databases, CHEMICAL ABSTRACTS (CA) and REGISTRY, include nearly 16 million abstracts of chemistry-related literature and patents and more than 30 million substance records respectively. 

The growth in interest in compounds having the Tg core structure can be seen when looking at the number of publications on such compounds. Figure 8 shows publications found from a Chemical Abstracts search for the Tg substructure showing both patent and nonpatent literature. It is clear that both the overall interest and the interest in patented applications have grown rapidly in the last 5-10 years and it is likely to continue as the properties of many new derivatives are explored. 

Further steps toward universality are taken by the replacement of element and compound names wherever possible by symbols and formulas, and by adding to data in older units their recalculated SI equivalents. The usefulness of the reference sections has been increased by giving journal-title abbreviations according to the Chemical Abstracts Service Source Index, by listing in each reference all of its authors and by accompanying references to patents and journals that may be difficult to access by their Chemical... 

Chemical Abstracts. Chemical Abstracts (CA) [23] is a collection of chemical information, with nearly 16 million abstracts of journal articles, patents, and other documents. In addition, the CAOLD database contains over 3 million abstracts from 1907-1966. Sources for CA include more than 8000 journals, patents, technical reports, books, conference proceedings, and dissertations from around the world. CA patent database covers 29 national patent offices and two international bodies. About 16% of the CA database, approximately 2.5 million records, are from the patent literature. Chemical Abstracts is commercially available from the American Chemical Society in several formats. 

Goncalves, A.A. and Saiago, C.A. "Composition for Use in Fracturing Petroleum Containing Formations," Brazil Patent 84/214(1985), Chemical Abstracts 104(10) 71519c(1986). 

Daccord, G., Lemanczyk, R., and Vercaemer, C. "Gelled Hydrocarbon Mixtures and Their Use in Hydraulic Crack Formation in Underground Formations," German Patent 3,247,758(1983), Chemical Abstracts 99(12) 90859h(1983). 

Burnham, J.W. "Fracturing Underground Formations," German Patent 2,915,455(1979), Chemical Abstracts 92(16) 131842y(1980). 

Mill, D.G. "Reducing the Viscoisty of an Organic Liquid, and Fracturing an Underground Formation," Brazil Patent 74/10408(1975), Chemical Abstracts 87(12) 87655k(1977). 

Nalone, W.T., Holtmyer, M.D., Tinsley, J.M., and Chattopadhyay, J. "Additive for Reducing Friction Pressure Loss of Liquid Hydrocarbons Flowing Through Pipes," German Patent 2,056,700(1971), Chemical Abstracts 75(12) 78860y(1971). 

Miller, K.A. "Pumping and Loading Emulsion Slurry Blasting Composition," European Patent Appl. 182,661A2(1986), Chemical Abstracts 105(16) 136821n(1986). 

Felix Hoffmann did not publish his version of the discovery, nor did he obtain a German patent, since the synthesis had been previously described. Farbenfabriken Bayer did obtain a U.S. Patent2 6 in 1900 which named him as the inventor. Chemical Abstracts reveal no subsequent publications by him, nor is there any record that he was publicly honored for his contribution. However, in 1899, he was appointed director of the pharmaceutical research and marketing division of Bayer. He retired in 19287. 

This article reviews relevant literature from 1951 to 1993. Recent papers cited in Chemical Abstracts through Vol. 121 (October 1994) are covered. Patents are included if they reveal new synthetic aspects or new applications. 

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