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. 19, 2020
Filed:
Sep. 30, 2015
Applicant:
Council of Scientific & Industrial Research, Rafi Marg New Delhi, IN;
Inventors:
Assignee:
COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH, New Delhi, IN;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G03C 1/735 (2006.01); C07D 471/04 (2006.01); B41M 5/00 (2006.01); C07D 471/06 (2006.01);
U.S. Cl.
CPC ...
G03C 1/735 (2013.01); B41M 5/00 (2013.01); C07D 471/04 (2013.01); C07D 471/06 (2013.01);
Abstract
The present invention disclose photochromic metal organic frameworks (MOFs) containing photochromic 1,4,5,8-naphthalenediimide (NDI) core and metal ions selected from Mg, Ca or Sr. The developed MOFs find application in inkless and erasable printing wherein they retain the photogenerated colour for a prolonged period of time so that the printed content remains legible/readable for reasonable time.