Granted Patent
Utility
US 4,996,396 · App. 07/428,933
Flow switch
Inventor:
Ronald J. Smith
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Oct 30, 1989
Inventor
Ronald J. Smith
Assignee (at issue)
IMO Industries 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.