Granted Patent
Utility
US 4,917,535 · App. 07/340,324
Pressure compensating flow rate control device with dual operating modes
Inventor:
Thomas N. Prassas
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: Apr 19, 1989
Inventor
Thomas N. Prassas
Assignee (at issue)
Aquapore Moisture Systems,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.