Granted Patent
Utility
US 4,813,482 · App. 07/098,425
Method for removal of paraffin from producing oil wells
Inventor:
William B. Walton
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Sep 17, 1987
Inventor
William B. Walton
Assignee (at issue)
GAF Corporation
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.