Granted Patent
Utility
US 5,294,089 · App. 07/923,818
Proportional flow valve
Inventor:
Drew LaMarca
Patented Case
View Patent ↗
Granted: Mar 15, 1994
Filed: Aug 3, 1992
Inventor
Drew LaMarca
Assignee (at issue)
Automatic Switch 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.