Granted Patent
Utility
US 5,393,866 · App. 08/149,779
Method for the production of polytetramethylene ether glycol
Inventors:
Nobuyuki Murai, Masayuki Shirato, Hiroshi Takeo, Hidetoshi Tanaka
Patented Case
View Patent ↗
Granted: Feb 28, 1995
Filed: Nov 10, 1993
Inventors
Nobuyuki Murai
Masayuki Shirato
Hiroshi Takeo
Hidetoshi Tanaka
Assignee (at issue)
Mitsubishi Kasei Corporation
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.