Granted Patent
Utility
US 5,300,257 · App. 07/888,925
4,4'-biphenylenediphosphonite compound and use thereof
Inventors:
Hiroyuki Akashi, Takeshi Inoue, Tetsuji Ike, Hidaka Yasuhiro, Shoichi Horie
Patented Case
View Patent ↗
Granted: Apr 5, 1994
Filed: May 27, 1992
Inventors
Hiroyuki Akashi
Takeshi Inoue
Tetsuji Ike
Hidaka Yasuhiro
Shoichi Horie
Assignee (at issue)
Yoshitomi Pharmaceutical Industries, 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.