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:
May. 16, 1978
Filed:
Jun. 11, 1973
Applicant:
Inventors:
Eric Albert Warwicker, Norfolk, EN;
David Price, Norfolk, EN;
Assignee:
Porvair Limited, Norfolk, EN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29D / ; B32B / ;
U.S. Cl.
CPC ...
428304 ; 260 / ; 264 41 ; 264 451 ; 264 458 ; 264 49 ; 428306 ; 428904 ;
Abstract
There is disclosed a process in which both non-solvent e.g., water and filler particles e.g., microscopic sodium chloride are added in certain proportions to a polymer solution e.g., polyurethane in dimethylformamide preferably at elevated temperature and coagulated by immersion in non-solvent. This results in a more rapid coagulation time than when solvent or filler alone are used and also results in a microporous product of improved properties and novel pore structure.