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:
May. 26, 1987
Filed:
Jun. 13, 1986
Applicant:
Inventors:
Assignee:
Pentel Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; C09D / ; D02G / ;
U.S. Cl.
CPC ...
428330 ; 106 19 ; 523164 ; 428364 ; 428401 ;
Abstract
A pencil lead comprising a binder, a filler and a colorant as essential components, said filler consisting at least partially of a fibrous material of magnesium oxysulfate. This pencil lead has a high bending strength and a stable quality which does not degrade with the lapse of time, and it can write well.
Iizuka, Fumio. (1987). Pencil lead composition with magnesium oxysulfate fibrous material (U.S. Patent No. 4668572). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4668572
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile