Granted Patent
Utility
US 4,328,865 · App. 06/177,398
Wax control in oil wells using a thermal syphon system
Inventor:
Edward Hall
Patented Case
View Patent ↗
Granted: May 11, 1982
Filed: Aug 12, 1980
Inventor
Edward Hall
Assignee (at issue)
Chromalloy American Corp.
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.