Granted Patent
Utility
US 4,624,313 · App. 06/748,039
Well tool dislodgement apparatus
Inventor:
Chester L. Coshow
Patented Case
View Patent ↗
Granted: Nov 25, 1986
Filed: Jun 24, 1985
Inventor
Chester L. Coshow
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.