Granted Patent
Utility
US 4,558,335 · App. 06/357,113
Thermoresponsive recording sheet
Inventors:
Naoki Hanayama, Eisaburo Kaku, Ryoichi Kinishi
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Mar 11, 1982
Inventors
Naoki Hanayama
Eisaburo Kaku
Ryoichi Kinishi
Assignee (at issue)
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.