Granted Patent
Utility
US 4,428,825 · App. 06/357,133
Catalytic hydrodewaxing process with added ammonia in the production of lubricating oils
Inventors:
John W. Ward, Timothy Carlson
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Mar 11, 1982
Inventors
John W. Ward
Timothy Carlson
Assignee (at issue)
Union Oil Company of California
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.