Granted Patent
Utility
US 4,879,896 · App. 07/086,792
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: Nov 14, 1989
Filed: Aug 19, 1987
Inventors
Ronnie F. Miller
Arthur L. Dwyer
Darwin A. Miller
Darwin L. Miller
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.