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:
Feb. 01, 1983
Filed:
Apr. 24, 1981
Applicant:
Inventors:
Harold Grossman, Silver Spring, MD (US);
Richard E Merrill, Wakefield, MA (US);
Paul B Monaghan, Lexington, MA (US);
Assignee:
Empire Enterprises, Inc., Shelbyville, TN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08K / ; C09D / ;
U.S. Cl.
CPC ...
523164 ; 106 19 ; 106 27 ; 524496 ; 524594 ;
Abstract
A 'cold-processed' thermoset plastic pencil lead is produced by extruding a composition formed by blending a mixture of a marking material, a phenolic novolac resin, a hardening agent, a plasticizer, and a lubricant. Blending, billeting, and extruding operations are performed at material temperatures that, in general, do not exceed about 200.degree. F. The extrudate is cured at higher temperatures of, for example, 260.degree. F. to 325.degree. F.