Source: http://www.google.es/patents/US4811217?dq=flatulence
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Patente US4811217 - Method of storing and searching chemical structure data - Google PatentesB�squeda Im�genes Maps Play YouTube Noticias Gmail Drive M�s » B�squeda avanzada de patentes | Historial web | Iniciar sesi�n B�squeda avanzada de patentesPatentesChemical structure data containing generic representation of component atoms in a storage device is searched by finding a match between a query structure and a stored candidate structure by mathematically comparing attribute data of chemical units of a query structure and attribute data of chemical unit...http://www.google.es/patents/US4811217?utm_source=gb-gplus-sharePatente US4811217 - Method of storing and searching chemical structure data N�mero de publicaci�nUS4811217 ATipo de publicaci�nConcesi�n N�mero de solicitud06/844,016 Fecha de publicaci�n7 Mar 1989 Fecha de presentaci�n25 Mar 1986 Fecha de prioridad29 Mar 1985Tambi�n publicado comoDE3685671D1, DE3685671T2, EP0196237A2, EP0196237A3, EP0196237B1 N�mero de publicaci�n06844016, 844016, US 4811217 A, US 4811217A, US-A-4811217, US4811217 A, US4811217A InventoresHideaki Chihara, Soichi Tokizane Cesionario originalJapan Association For International Chemical InformationCitas de patentes (4), Otras citas (20), Citada por (62), Clasificaciones (8) Enlaces externos: USPTO, Cesi�n de USPTO, EspacenetMethod of storing and searching chemical structure dataUS 4811217 A Resumen Chemical structure data containing generic representation of component atoms in a storage device is searched by finding a match between a query structure and a stored candidate structure by mathematically comparing attribute data of chemical units of a query structure and attribute data of chemical unit of a stored candidate structure, where attribute data represent chemical characteristics of chemical units of those structures.
One approach is to store specific structures expressed by the generic structures. Practically a database containing structure information of substances specifically identified in patent examples is widely used. One example is the Registry File of CAS ONLINE. But patent examples usually describe only a portion of the generic structures in a claim, and thus it is not usually true that the combination of all chemical structures in the examples corresponds to the claimed generic expression. It is certainly not practical to expand generic structures into component specific structures, since the number of specific structures derived from one generic structure easily explodes to millions. For example, an expression C4-C5 alkyl group represents 12 specific alkyl radicals. If a generic structure contains three of these expressions, the combination will result in 12
TABLE 2______________________________________              RING NUMBERRING          RING       MIN-      MAX-ATOM          SIZE       IMUM      IMUMNO.   O     S     N   A   4 5 6 &amp;gt;6 1   2   3   1   2   3______________________________________1     0     0     1   0   0 0 1 0  1   0   0   1   1   12     0     0     1   0   0 0 1 0  1   0   0   1   1   13     0     0     1   0   0 0 1 0  1   0   0   1   1   14     0     0     1   0   0 0 1 0  1   0   0   1   1   15     0     0     1   0   0 0 1 0  1   0   0   1   1   16     0     0     1   0   0 0 1 0  1   0   0   1   1   17     1     0     0   0   0 1 1 0  1   1   0   1   1   1______________________________________
TABLE 4______________________________________              RING NUMBERRING          RING       MIN-      MAX-ATOM          SIZE       IMUM      IMUMNO.   O     S     N   A   4 5 6 &amp;gt;6 1   2   3   1   2   3______________________________________A     0     0     1   0   0 0 0 0  1   0   0   0   0   0B     1     0     0   0   0 1 0 0  1   0   0   1   1   1C     1     0     0   0   0 1 0 0  1   0   0   1   1   1D     1     0     0   0   0 1 0 0  1   0   0   1   1   1E     1     0     0   0   0 1 0 0  1   0   0   1   1   1F     1     0     0   0   0 1 0 0  1   0   0   1   1   1______________________________________
Here nodes of the query structure (hereafter called query nodes) are numbered by i. By definition, 0&lt;i&lt;=m, where m is the count of the query nodes. Similarly, nodes of a candidate structure in the file (hereafter called file nodes) are numbered by j. Also by definition, 0&lt;j&lt;=n, where n is the number of file nodes. A vector P(i) is defined to store the number of a file node which matches the query node i. Another vector M(j) is defined to mark if the file node j is already matched with a query node. If it is, its value is 1. Otherwise it is 0. Since a generic file node may be matched with multiple query nodes, the M(j) value of a generic file node is kept 0. An examination of a file structure against a query structure is conducted by comparing every query node (0&lt;i&lt;=m) with every file node (0&lt;j&lt;=n), except those file nodes already matched with query nodes, for which M(J) equals 1.
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