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:
Dec. 15, 1987
Filed:
Jun. 06, 1983
Applicant:
Inventors:
John F Cairns, Cheshire, GB;
Gawin W Cowell, Cheshire, GB;
Assignee:
Imperial Chemical Industries PLC, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25B / ;
U.S. Cl.
CPC ...
204296 ; 427 34 ;
Abstract
A diaphragm of a porous sheet of an organic polymer for example, polytetrafluoroethylene, which contains a wetting agent distributed throughout the thickness of the sheet, the concentration of the wetting agent in that part of the sheet near to one or to both outer surfaces of the sheet being greater than the concentration of the wetting agent in that part of the sheet remote from the outer surfaces of the sheet.