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. 27, 1982
Filed:
Oct. 30, 1978
Applicant:
Inventors:
Aitken M Couper, Runcorn, GB;
Stuart F Mellish, Runcorn, GB;
Assignee:
Imperial Chemical Industries Limited, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25B / ; C25B / ;
U.S. Cl.
CPC ...
204296 ;
Abstract
A method of manufacturing a porous diaphragm of an organic polymeric mateial, e.g. of polytetrafluoroethylene, suitable for use as a diaphragm in an electrolytic cell, the method comprising forming a sheet of organic polymeric material containing particulate dextrin, for example by heating a starch-containing sheet, optionally in the presence of acid, to convert the starch in the sheet to dextrin, and extracting the dextrin from the sheet, for example by contacting the sheet with caustic alkali and/or with alkali metal hypochlorite.