Abstracts Chemical patents

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. 

The most comprehensive of the abstracts for theoretical and applied chemistry and chemical engineering. Indexes and abstracts of patents and of worldwide periodicals. 

Clainis/U,S. piilcni abstracts patents issued by the U,S. Patent Office chemical patent records from 1950 to present... 

Chowdhury, G. C., and M. F. Lynch. 1992a. Automatic interpretation of the texts of chemical patent abstracts. 1. Lexical analysis and categorization. J. Chem. Inf. Comput. Sci. 32(5)463-467. 

The EPO esp cenet (ep.espacenet.com) database contains more than 60 million patents from 85 conntries worldwide (not just European Convention countries). The database is searchable by application number, assignee, inventor, or keywords from the title or abstract. Chemical structure searches are not possible. Patents can be viewed as images of the original document in PDF format one page at a time, or the whole patent can be viewed as a text document. Instantaneous translation from French or German into English is available for the latter document type if required. Equivalent pnblished patents, if any, are also listed and are available in PDF format. The text documents do not show chemical structures or diagrams, but these can be viewed in PDF format if required. 

The period from 1960 onwards saw perfluoroaromatic chemistry rapidly unfold, selective methods for fluorination develop, and fluorinated compounds play an increasingly important role in the pharmaceutical and plant-protection industries. Indeed, there have been so many interesting developments in the subject since the original edition [3] that it will be impossible to do justice to this era in one small volume. Remarkably, it has been reported that organofluorine compounds constitute 6-7% of all new compounds recorded in Chemical Abstracts up to 1990 and 7-8% of all chemical patents up to 1997 contain fluorinated compounds. This in itself is an outstanding output for the relatively limited number of workers in the field worldwide and is a tribute to their dedication [59]. 

Searching patents is an art in itself and cannot be discussed in detail here. Appropriate patent classes are usually searched at the Patent Office in Washington. Chemical Abstracts covers some patents. Searchers may consult the Uniterm Index of Chemical Patents and other aids. They will have difficulty with the Annual Patent Index of the Official Gazette of the 17. S. Patent Office, because the entries are listed by title and inventors. As titles do not correspond to subjects, this index is not very useful. 

Andrews, D. D., Technical Problems in the Reclassification of Chemical Patents, Abstracts of Papers, I29th Meeting, ACS, April 1956, p. I5G. 

A good independent check is available for the middle of this period. Worden (15) attempted to index all United States chemical patents issued between January 1, 1915, and December 31, 1924. The number of patents indexed was 22,882, 5.7% of the 398,378 United States patents issued in that period. Close to 24,140 patents of this span, amounting to 6.1%, were abstracted in Chemical Abstracts, so that the comparison inspires confidence in the extent of its coverage while verifying the significance of the data in Table 1. 

A thorough search of United States chemical patents since 1907 can be made in any good library by the use of Chemical Abstracts. The tables and Figure 1 inspire confidence in such a search. But it is a laborious and tedious method, especially since one must order and wait for the pertinent patent copies in order to complete the study. 

Changes in the classification of British patents can be illustrated by the disposition of chemical patents. The abridgments covering the earliest patents, issued between 1588 and 1883, are divided into 103 classes. Volume 40 of this series, Acids, Alkalies, Oxides, and Salts, contains abstracts dealing with the manufacture of salt, saltpeter, alum, and vitriol, and the separation of silver from lead, among other subjects. 

The United States Patent Office has a numerical set of Soviet patents numbered 1 to 3500 (1924 to 1927) and starting again with 116,000 (1958). The first two patents were chemical in nature, the first on a furnace for the continuous preparation of sodium sulfide and the second on water purification IChem. Abstracts, 27, 3787, 3763 (1933)]. The patents issued since 1927 have not been available information concerning some of the chemical patents has been published in Chemical Abstracts based on abstracts given in the Russian Patent Office periodical. The latter is a monthly publication containing abridgments of issued patents, lists of applications, utility models, information on trade-marks. Patent Office notices, and reviews of current technical literature. A superb summary of the patent law, its administration, and the availability of abstracts was presented recently by Hoseh (248). 

Bur. Census, Census Bull. 210 appendix to Census Reports, Vol. 10, Twelfth Census of U. S. Manufactiuers, Part 4, Special Reports on Selected Industries Classified abstracts of chemical patents, 183 1902. 

Chemical Abstracts, Numerical patent indexes Vols. 1-30, 31-40, 41-50, annual since then. 

Chicago Section, American Chemical Society, Abstracts of Chemical Patents Vested in Alien Property Custodian, classified and indexed by Science-Technology Group, Special Libraries Association, edited and published by Office of Alien Property Custodian, Washington, D. C., 1944. 

Items under this category are too numerous to attempt an extensive listing herein, especially in view of the existence of excellent bibliographies such as the one by von Hohenhoff (18) and the List of Periodicals Abstracted by Chemical Abstracts [50, 1J-314J (Nov. 25-Dec. 10, 1956)1 and annual Supplements [51, 1T-27J (Nov. 10-25, 1957), 53. 1J-32J (Dec. 10, 1959)], 52, 1J-40J (Dec. 10, 1958). Valuable review articles have appeared in Chemical Reviews and the volumes of Annual Survey of American Chemistry. Outstanding reviews, in some cases an annual feature in the January issue, have been published in the following journals. (Those marked with an asterisk regularly feature a patent abstract or patent list section.)... 

Many chemical patent references are to be found in books, which in turn are usually readily located through bibliographies, publishers catalogs, or abstracts of book reviews. Many of the American Chemical Society monographs contain abundant patent references. The following list is illustrative of the variety that is available both as to breadth of field and the scope within the field. 

From around 1850, cover applied and pure chemistry. Excellent abstracts of patents and literature, some not found in Chemisches Zentralblatt subject index fairly adequate. Wagner has a rather complete German patent number index in the chemical field. 

Chicago Section, ACS, Abstracts of Chemical Patents Vested in the Alien Property... 

---