Granted Patent
Utility
US 5,698,749 · App. 08/524,195
Catalysts for the hydrogenation of aqueous maleic acid to 1,4-butanediol
Inventors:
S. Erik Pedersen, John G. Frye, Jr., Thomas G. Attig, John R. Budge
Patented Case
View Patent ↗
Granted: Dec 16, 1997
Filed: Sep 6, 1995
Inventors
S. Erik Pedersen
John G. Frye, Jr.
Thomas G. Attig
John R. Budge
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.