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:
Oct. 11, 1983
Filed:
Jun. 18, 1981
Applicant:
Inventor:
Hueng T Kim, Avon Lake, OH (US);
Assignee:
The B. F. Goodrich Company, Akron, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29D / ;
U.S. Cl.
CPC ...
264 53 ; 2641 / ; 264D / ; 425208 ; 425209 ; 4258 / ; 521145 ;
Abstract
Cellular thermoplastic resin is made by the method and extrusion apparatus that is characterized by a compaction section where the resin is densified, a choke section where a barrier of the densified resin is formed that is substantially impervious to a gaseous blowing agent, and a mixing section where the particulate resin is mixed with a blowing agent and then melted before being extruded into a zone of lower pressure whereby the blowing agent expands to form the cellular product. By mixing the blowing agent with a solid rather than a molten resin, the resulting mixture can be melted at a substantially lower temperature.