Granted Patent
Utility
US 4,276,945 · App. 06/046,829
Mud return line connector apparatus
Inventor:
Bobby N. Ward, Sr.
Patented Case
View Patent ↗
Granted: Jul 7, 1981
Filed: Jun 8, 1979
Inventor
Bobby N. Ward, Sr.
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.