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:
Nov. 01, 1977
Filed:
Dec. 11, 1974
Francis S Galasso, Manchester, CT (US);
Romeo G Bourdeau, South Windsor, CT (US);
Roscoe A Pike, Simsbury, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
A process for producing continuous filaments from polyamic acid suitable for conversion to polyimide filaments comprising providing a starting solution consisting essentially of equimolar amounts of P,P-diaminophenyl ether and bis-(3,4-dicarboxyphenyl) sulfone dianhydride, the remainder a solvent selected from the group consisting of dimethylformamide, methyl pyrrolidone and mixtures thereof, said starting solution having a viscosity ranging from 500 to 5,000 centipoises preferably 1,500 to 3,000 centipoises, and forming the starting solution into filaments by extruding it in a coagulating bath consisting essentially of a liquid selected from the group consisting of propanol, methyl alcohol, ethyl alcohol, butyl alcohol, a mixture of ethyl alcohol and propanol and a mixture of methyl alcohol and acetone.