Granted Patent
Utility
US 5,420,238 · App. 08/216,549
Poly(silyleneethynylene phenyleneethynylenes), method for preparing same and hardened product thereof
Inventors:
Masayoshi Ito, Masahiko Mitsuzuka, Kenji Iwata, Koji Inoue, Tetsura Utsumi
Patented Case
View Patent ↗
Granted: May 30, 1995
Filed: Mar 23, 1994
Inventors
Masayoshi Ito
Masahiko Mitsuzuka
Kenji Iwata
Koji Inoue
Tetsura Utsumi
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.