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:
Sep. 02, 1997
Filed:
Feb. 03, 1995
Duncan McL Grieve, Saffron Walden, GB;
Justine A Mooney, Austin, TX (US);
William E Bottomley, Harlow, GB;
John H Stibbard, Bishops Stortford, GB;
Andrew W Mott, Harlow, GB;
Robert J Nairne, Loughton, GB;
David C Bays, Harlow, GB;
Stephen S Poon, Woodbury, MN (US);
Raymond J Kenney, Mahtomedi, MN (US);
Gilbert L Eian, Woodbury, MN (US);
Takuzo Ishida, St. Paul, MN (US);
Doreen C Lynch, St. Paul, MN (US);
Roger A Mader, North Lake Elmo, MN (US);
Sharon M Simpson, St. Paul, MN (US);
Kim M Vogel, St. Paul, MN (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
A thermographic element comprising in a non-aqueous binder medium a silver salt oxidizing agent in reactive association with a compound comprising a plurality of redox color releasing moieties such that oxidation of each redox color releasing moiety causes release from said compound of a thermally diffusible dye. The compounds many of which are new incorporate two or more developer moieties into a single molecule to minimize the diffusibility of the compound. Following oxidation, either directly by the silver salt or by means of a cross-oxidizing agent, each oxidized developer moiety releases a thermally diffusible dye. The compounds are of sufficient size and molecular weight to slow or prevent diffusion in imaging systems and yet possess several active developer moieties per molecule which is advantageous over known ballasted dye releasers which comprise bulky molecules with only a single developer moiety.