Granted Patent
Utility
US 5,093,380 · App. 07/499,346
Polyurethane flexible foam and method for its production
Inventors:
Hiromitsu Takeyasu, Tsunehisa Sonobe, Yoshiyuki Yamaguchi, Takao Doi
Patented Case
View Patent ↗
Granted: Mar 3, 1992
Filed: Aug 15, 1990
Inventors
Hiromitsu Takeyasu
Tsunehisa Sonobe
Yoshiyuki Yamaguchi
Takao Doi
Assignee (at issue)
ASAHI GLASS 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.