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. 12, 1980
Filed:
Sep. 24, 1975
Applicant:
Inventors:
Phillip E Sokol, Rockville, MD (US);
Robert F Farmer, Gaithersburg, MD (US);
Assignee:
The Gillette Company, Boston, MA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
D21H / ; B44F / ;
U.S. Cl.
CPC ...
428 29 ; 35 / ; 106 21 ; 427145 ; 428199 ; 428411 ; 428537 ;
Abstract
This invention relates to alkali developable, paper-based systems printed with invisible phenolphthalein inks and made reusable through many development cycles by employing critical concentrations of dye reactants in conjunction with a paper having a defined water soluble acidity-alkalinity.
Sokol, Phillip. (1980). Latent image printing and development (U.S. Patent No. 4188431). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4188431
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile