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:
May. 30, 1989
Filed:
Sep. 11, 1986
Applicant:
Inventor:
Frederick H Howell, Atherton, GB;
Assignee:
Ciba-Geigy AG, Basel, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ; C07C / ;
U.S. Cl.
CPC ...
568662 ; 2603 / ; 2603 / ; 558214 ; 560 75 ; 568766 ;
Abstract
New hydroquinones have 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 (i) -OX or (ii) -PO(OR.sub.11)((O).sub.x R.sub.11); and salts thereof with organic or inorganic acid bases. The groups X and R.sub.11 and x are defined hereinafter. The compounds of formula I are useful as stabilisers in photographic materials.
Howell, Frederick. (1989). Hydroquinones (U.S. Patent No. 4835323). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4835323
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile