Granted Patent
Utility
US 5,646,292 · App. 08/643,357
Blowing agents of tetrazoles and their derivatives
Inventors:
Satoshi Nakagawa, Hideki Ogawa, Hiroaki Tanaka, Atsuhiro Onishi
Patented Case
View Patent ↗
Granted: Jul 8, 1997
Filed: May 6, 1996
Inventors
Satoshi Nakagawa
Hideki Ogawa
Hiroaki Tanaka
Atsuhiro Onishi
Assignee (at issue)
Toyo Kasei Kogyo Company Limited
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.