Granted Patent
Utility
US 4,538,645 · App. 06/523,909
Control valve assembly
Inventor:
Asi Perach
Patented Case
View Patent ↗
Granted: Sep 3, 1985
Filed: Aug 16, 1983
Inventor
Asi Perach
Assignee (at issue)
Ambac Industries, Incorporated
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.