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:
Feb. 12, 1991
Filed:
Jan. 18, 1990
Applicant:
Inventors:
Irl E Ward, Hatfield, PA (US);
Francis W Michelotti, Easton, PA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C11D / ; C23G / ;
U.S. Cl.
CPC ...
134 38 ; 252142 ; 252171 ; 430329 ;
Abstract
A non-aqueous biodegradable negative photoresist stripping composition having low toxicity and is operable at temperatures at 85.degree. C. or less which comprises about 85% by weight of an aromatic hydrocarbon solvent of the formula selected from the group consisting of: ##STR1## wherein R.sub.1 and R.sub.2 are the same or different and each is a member selected from the group consisting of methyl, ethyl n-propyl and isopropyl, and an organic sulfonic acid of the formula: