The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 08, 1994
Filed:
Mar. 10, 1993
Applicant:
Inventors:
Hans Baumann, Oberwil, CH;
Rox Phaff, Itingen, CH;
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
544 89 ; 544 95 ; 544 54 ;
Abstract
The invention relates to chromogenic lactams, to their preparation and to the use thereof in pressure-sensitive or heat-sensitive recording materials. The novel lactams have the general formula I ##STR1## wherein the ring A is an aromatic or heteroaromatic radical containing 6 ring atoms;