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:
Jul. 24, 1990
Filed:
Jul. 06, 1989
Applicant:
Inventors:
Richard M Lazarus, Mission Viejo, CA (US);
Edward J Reardon, Laguna Niguel, CA (US);
Sunit S Dixit, Mission Viejo, CA (US);
Assignee:
Morton Thiokol, Inc., Chicago, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
430192 ; 430165 ; 430166 ; 430191 ; 430193 ; 430326 ;
Abstract
Positive photoresist compositions are provided which contain (a) a mixture of mono-, di-, and triesters of 2,3,4-trihydroxybenzophenone and 1,2-naphthoquinone-2-diazo-4-sulfonic acid and (b) a novolak resin selected from resins prepared from a phenolic component having a high p-cresol content or from a mixture of formaldehyde and an aromatic aldehyde.