Granted Patent
Utility
US 4,698,561 · App. 06/913,125
Use of SCR's in extended retarding
Inventors:
Sabern D. Buchanan, Stephen L. Faulkner
Patented Case
View Patent ↗
Granted: Oct 6, 1987
Filed: Sep 29, 1986
Inventors
Sabern D. Buchanan
Stephen L. Faulkner
Assignee (at issue)
Unit Rig & Equipment
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.