Granted Patent
Utility
US 4,648,553 · App. 06/753,189
Regulating valve
Inventor:
John T. Muller
Patented Case
View Patent ↗
Granted: Mar 10, 1987
Filed: Jul 9, 1985
Inventor
John T. Muller
Assignee (at issue)
Leslie 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.