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:
Apr. 18, 1989
Filed:
Nov. 06, 1987
Applicant:
Inventors:
James M Lewis, Williamsville, NY (US);
Robert A Owens, E. Amherst, NY (US);
Susan A Ferguson, W. Seneca, NY (US);
Roland L Chin, Williamsville, NY (US);
Valentine T Zuba, Hamburg, NY (US);
Assignee:
Petrarch Systems, Inc., Bristol, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03F / ;
U.S. Cl.
CPC ...
430326 ; 430302 ; 430309 ;
Abstract
High contrast, sensitivity and bath life is obtainable by the addition of inorganic salts, preferably a carbonate, to an aqueous alkali metal base containing a carboxylated surfactant. The preferred alkali metal bases are potassium hydroxide or sodium hydroxide. The carboxylated surfactants contemplated by the invention are those encompassed with the formula: