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:
Aug. 03, 1976
Filed:
Oct. 22, 1974
Applicant:
Inventor:
Hiroaki Koyama, Osaka, JA;
Assignee:
Nippon Kynol Inc., Osaka, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D06M / ; D06M / ; D06M / ;
U.S. Cl.
CPC ...
260841 ; 81155 ; 260 54 ; 260 55 ; 260 56 ; 260 / ; 260843 ; 260847 ; 260848 ; 2641 / ; 264236 ; 264347 ;
Abstract
A process for producing melt-spun and cured phenolic filaments having improved tenacity and whiteness which comprises treating cured phenolic filaments with an alcohol having 1 to 6 carbon atoms or acetone and reacting the thus-treated phenolic filaments with an esterifying solution containing acetic anhydride in the presence of an inorganic acid of phosphorus as an esterifying catalyst.