Granted Patent
Utility
US 4,827,001 · App. 07/115,945
Preparation of .gamma.-butyrolactone and 1,4-butanediol by catalytic hydrogenation of maleic acid
Inventors:
Thomas G. Attig, Anne M. Graham
Patented Case
View Patent ↗
Granted: May 2, 1989
Filed: Nov 2, 1987
Inventors
Thomas G. Attig
Anne M. Graham
Assignee (at issue)
The Standard Oil Company
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.