Granted Patent
Utility
US 5,691,272 · App. 08/696,464
Carboxylate and heat-sensitive recording material using same
Inventors:
Mansuke Matsumoto, Nobuaki Sasaki, Bunji Sawano, Kiyoharu Hasegawa, Kazuyoshi Kikkawa
Patented Case
View Patent ↗
Granted: Nov 25, 1997
Filed: Aug 14, 1996
Inventors
Mansuke Matsumoto
Nobuaki Sasaki
Bunji Sawano
Kiyoharu Hasegawa
Kazuyoshi Kikkawa
Assignees (at issue)
Mitsui Toatsu Chemicals, Incorporated
YAMAMOTO CHEMICALS, INC.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.