Granted Patent
Utility
US 4,317,943 · App. 06/186,933
Process for preparing glycol ethers
Inventor:
John F. Knifton
Patented Case
View Patent ↗
Granted: Mar 2, 1982
Filed: Sep 12, 1980
Inventor
John F. Knifton
Assignee (at issue)
Texaco Inc.
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.