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:
Jan. 11, 1994
Filed:
Nov. 06, 1990
Applicant:
Inventors:
Michael Ingham, Yorkshire, GB;
Paul A Styan, Leeds, GB;
Assignee:
Du Pont-Howson Limited, Seacroft, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03F / ; G03F / ; G03F / ; C11D / ;
U.S. Cl.
CPC ...
430331 ; 430157 ; 430165 ; 430176 ; 430192 ; 430278 ; 430302 ; 252 86 ; 252156 ; 25217421 ;
Abstract
A developer liquid for image-wise exposed radiation sensitive compositions comprises ethyl hexyl sulphate, a surfactant, and alkaline material such that the pH is al least 12 and preferably at least 13.5. The developer liquid may additionally include a water soluble carboxylic acid salt such as sodium octanoate and the sodium salt of ethylene diamine tetra acetic acid. Such developer liquids can be formulated for use with both positive-working and negative-working compositions.