Granted Patent
Utility
US 5,246,978 · App. 07/610,689
Polyol and rigid polyurethane foam
Inventors:
Satoshi Ozaki, Tsukuru Izukawa, Haruhiko Kawakami, Takayoshi Masuda, Toshio Nozawa
Patented Case
View Patent ↗
Granted: Sep 21, 1993
Filed: Nov 8, 1990
Inventors
Satoshi Ozaki
Tsukuru Izukawa
Haruhiko Kawakami
Takayoshi Masuda
Toshio Nozawa
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.