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:
Dec. 10, 1985
Filed:
Dec. 22, 1982
Applicant:
Inventors:
Assignee:
Pentel Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B43K / ; B43K / ;
U.S. Cl.
CPC ...
401 34 ; 401 21 ; 401 17 ; 401 18 ; 401 19 ; 401 23 ; 252 891 ; 252 94 ; 106 20 ;
Abstract
Colored ink comprising a developer having a phenolic hydroxyl group, an electron-donating colorless dye which develops a color by the action of the developer, and a solvent which does not inhibit a color developing reaction. Handwriting written in this colored ink can be erased by using an eraser comprising a desensitizing compound which makes the colored electron-donating dye colorless.
Quick Actions:
Iwata, Masahiro. (1985). Ink and eraser of the ink (U.S. Patent No. 4557618). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4557618
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile