Granted Patent
Utility
US 4,892,955 · App. 07/072,744
Method for producing a lactone
Inventors:
Keisuke Wada, Yoshinori Hara, Koushi Sasaki
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Jul 13, 1987
Inventors
Keisuke Wada
Yoshinori Hara
Koushi Sasaki
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.