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:
Apr. 26, 1977
Filed:
Mar. 12, 1975
John W Soehngen, Berkeley Heights, NJ (US);
Albert G Williams, West Orange, NJ (US);
Celanese Corporation, New York, NY (US);
Abstract
An improved process is provided for producing a pyrolyzed carbonaceous filamentary material. The process utilizes a novel precursor of relatively high carbon content comprising a homogeneous blend of polystyrene and a substantial proportion of inexpensive pitch. Following melt spinning the resulting filamentary material is hot drawn, thermally stabilized, and carbonized. The thermal stabilization step of the process comprises the sulfonation of the previously hot drawn filamentary material. The thermally stabilized filamentary material optionally may be carbonized and graphitized. Processing difficulties commonly associated with a pitch precursor are effectively overcome.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile