Granted Patent
Utility
US 4,533,802 · App. 06/619,851
Liquid flow switch and method of using same
Inventor:
Peter S. Spalding
Patented Case
View Patent ↗
Granted: Aug 6, 1985
Filed: Jun 12, 1984
Inventor
Peter S. Spalding
Assignee (at issue)
Alcan Aluminum Corporation
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.