Granted Patent
Utility
US 4,986,128 · App. 07/455,621
In-line pressure gauge
Inventor:
Marvin D. Burns
Patented Case
View Patent ↗
Granted: Jan 22, 1991
Filed: Dec 22, 1989
Inventor
Marvin D. Burns
Assignee (at issue)
The DeVilbiss 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.