Granted Patent
Utility
US 5,661,100 · App. 08/521,031
Urea (thiourea) derivative and thermal recording sheet using the same
Inventors:
Toshiaki Minami, Tomoaki Nagai, Kaoru Hamada, Akio Sekine, Ryoichi Kinishi, Ryuzo Minakami
Patented Case
View Patent ↗
Granted: Aug 26, 1997
Filed: Aug 29, 1995
Inventors
Toshiaki Minami
Tomoaki Nagai
Kaoru Hamada
Akio Sekine
Ryoichi Kinishi
Ryuzo Minakami
Assignees (at issue)
NIPPON PAPER INDUSTRIES, CO., LTD.
Yoshitomi Pharmaceutical Industries, Ltd.
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.