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:
Mar. 21, 2023
Filed:
Sep. 05, 2016
Thermographic Measurements Ltd, Devon, GB;
Bagavant Shivkumar, Merseyside, GB;
Philippe Marrec, Lannion, FR;
Thermographic Measurements Ltd, Devon, GB;
Abstract
Novel reaction media for electron donating and electron accepting components in colour-change compositions are described. The compound is of formula (VI); R, and Rare independently selected from an optionally substituted linear or branched alkyl group, alkenyl group, alkoxy group, aryl group and an alkylene aryl group having from 5 to 22 carbon atoms; Xand Xare independently selected from —OC(O)—, —CO— and O; Y, and Yare independently selected from hydrogen, halogen, R, —OR; y is independently 0 or 1; and suitably the groups RX— and —XRare independently in the ortho or meta position. The compounds are useful in ink compositions, writing implements containing the compound and medical and industrial applications in which temperature sensitive colour change may be required.