Granted Patent
Utility
US 4,570,490 · App. 06/505,142
Differential pressure ratio measurement system
Inventor:
Frank J. Antonazzi
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: Jul 25, 1983
Inventor
Frank J. Antonazzi
Assignee (at issue)
ALLIED CONSULTING, 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.