Granted Patent
Utility
US 4,315,643 · App. 06/152,769
Heat-sensitive transfer element
Inventors:
Yukio Tokunaga, Kiyoshi Sugiyama, Tadao Seto
Patented Case
View Patent ↗
Granted: Feb 16, 1982
Filed: May 23, 1980
Inventors
Yukio Tokunaga
Kiyoshi Sugiyama
Tadao Seto
Assignees (at issue)
Nippon Telegraph and Telephone Public Corporation
Fuji Kagakushi Kogyo 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.