Granted Patent
Utility
US 4,771,694 · App. 06/898,052
Blasting signal transmission tube connector
Inventors:
Stephen W. Bartholomew, Daniel C. Rontey, Clifford N. Kaiser, William J. Necker
Patented Case
View Patent ↗
Granted: Sep 20, 1988
Filed: Aug 19, 1986
Inventors
Stephen W. Bartholomew
Daniel C. Rontey
Clifford N. Kaiser
William J. Necker
Assignee (at issue)
The Ensign-Bickford Company
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.