Granted Patent
Utility
US 4,937,359 · App. 07/324,023
Process for preparing (S)-4-methyl-.beta.-butyrolactone
Inventors:
Dieter Seebach, Axel Griesbeck
Patented Case
View Patent ↗
Granted: Jun 26, 1990
Filed: Mar 16, 1989
Inventors
Dieter Seebach
Axel Griesbeck
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.