Granted Patent
Utility
US 4,503,301 · App. 06/478,436
Differential fluid pressure switch
Inventor:
Ronald Kurtz
Patented Case
View Patent ↗
Granted: Mar 5, 1985
Filed: Mar 24, 1983
Inventor
Ronald Kurtz
Assignee (at issue)
American Standard 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.