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:
Jan. 24, 1995
Filed:
Jan. 25, 1994
Dian E Stevenson, Saffron Walden, GB;
Mark P Kirk, Stortford, GB;
Sylvia A Farnum, Lakeland, MN (US);
William C Frank, Roseville, MN (US);
Randall H Helland, Maplewood, MN (US);
Jonathan P, Kitchin, White Bear Lake, MN (US);
Roger A Mader, Stillwater, MN (US);
Mark B Mizen, St. Paul, MN (US);
Richard A Newmark, St. Paul, MN (US);
William D Ramsden, Afton, MN (US);
Kumars Sakizadeh, Woodbury, MN (US);
Terence D Spawn, Maplewood, MN (US);
George V Tiers, St. Paul, MN (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
A thermal-dye-bleach construction comprising a dye in association with a thermal dye-bleaching agent of general formula I: ##STR1## wherein: each of R.sup.a and R.sup.b are individually selected from: hydrogen, an alkyl group, an alkenyl group, a cycloalkyl group, an aralkyl group, an aryl group, and a heterocyclic group, and preferably, both R.sup.a and R.sup.b represent hydrogen;