Granted Patent
Utility
US 5,142,001 · App. 07/740,258
Polyurethane composition
Inventors:
Masahiko Yasuda, Shigeo Hosokawa, Yorozu Yokomori, Yukiyoshi Ito, Koji Hisamura
Patented Case
View Patent ↗
Granted: Aug 25, 1992
Filed: Aug 5, 1991
Inventors
Masahiko Yasuda
Shigeo Hosokawa
Yorozu Yokomori
Yukiyoshi Ito
Koji Hisamura
Assignees (at issue)
KYOWA HAKKO KOGYO CO., LTD.
B. F. Goodrich Company
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.