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:
Jul. 08, 1997
Filed:
Nov. 07, 1995
Katsunori Kitazawa, Takasaki, JP;
Kazutaka Aoki, Iwata, JP;
Mitsubishi Pencil Kabushiki Kaisha, Tokyo, JP;
Abstract
There are herein disclosed calcined pencil leads which have a high strength, excellent light resistance and weathering resistance as well as a sharp color and which can easily be erased by an eraser, and a method of manufacturing the calcined pencil leads. In the calcined pencil leads containing, as at least a colorant, a pigment obtained by forming the pigment in the open cells of the pencil leads, the pigment can be obtained by any of (1) a process of impregnating the open cells with a solution containing the dissolved organic pigment, and then solidifying the pigment, (2) a process of impregnating the open cells with a solution containing a pigment precursor, and then reacting it, and (3) a process of impregnating the open cells with a dye solution, and then forming a lake.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile