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. 20, 1984
Filed:
Jun. 18, 1982
Applicant:
Inventor:
Frederick H Howell, Atherton, GB;
Assignee:
Ciba-Geigy AG, Basel, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
560 75 ; 544 87 ; 544173 ; 546189 ; 546226 ; 548524 ; 548571 ; 549414 ; 549415 ; 549420 ; 549426 ; 549427 ; 549473 ; 549475 ; 549480 ; 549493 ; 549501 ; 562478 ; 564153 ; 564155 ; 564170 ;
Abstract
New hydroquinones having the formula: ##STR1## wherein p is 1 or 2 and q is 0 or 1, provided that p+q is 1 or 2; R is a residue of formula: ##STR2## wherein Q is selected from the residues --COZR.sub.4 wherein Z is 0 or NR.sub.5, --OX wherein X is R.sub.5 or --COR.sub.7, --NR.sub.8 R.sub.9, --PO(OR.sub.10)[O].sub.x R.sub.11 wherein x is 0 or 1, --SO.sub.2 R.sub.12 or --CN, and salts thereof with organic or inorganic acid bases. The groups, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.7, R.sub.8, R.sub.9, R.sub.10, R.sub.11, R.sub.12, k and n are defined hereafter. These compounds are used as stabilizers in photographic materials.