Granted Patent
Utility
US 4,601,194 · App. 06/571,823
Method and apparatus for leak testing of pipe
Inventors:
Ronnie F. Miller, Arthur L. Dwyer, Darwin A. Miller, Darwin L. Miller
Patented Case
View Patent ↗
Granted: Jul 22, 1986
Filed: Jan 18, 1984
Inventors
Ronnie F. Miller
Arthur L. Dwyer
Darwin A. Miller
Darwin L. Miller
Assignee (at issue)
Damco Testers, Inc.
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.