Granted Patent
Utility
US 4,093,633 · App. 05/763,506
Process for preparing tetrahydrofuran
Inventors:
Yasuo Tanabe, Jun Toriya, Masato Sato, Ken Shiraga
Patented Case
View Patent ↗
Granted: Jun 6, 1978
Filed: Jan 28, 1977
Inventors
Yasuo Tanabe
Jun Toriya
Masato Sato
Ken Shiraga
Assignee (at issue)
Mitsubishi Chemical 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.