Granted Patent
Utility
US 4,673,618 · App. 06/724,102
Thermal recording medium
Inventors:
Kunihiro Koshizuka, Takao Abe, Shigehiro Kitamura, Hiroshi Watanabe
Patented Case
View Patent ↗
Granted: Jun 16, 1987
Filed: Apr 17, 1985
Inventors
Kunihiro Koshizuka
Takao Abe
Shigehiro Kitamura
Hiroshi Watanabe
Assignee (at issue)
Konishiroku Photo Industry Co., 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.