Granted Patent
Utility
US 4,253,640 · App. 06/020,324
Actuation system for valve with compound closure movement
Inventors:
Werner K. Priese, Charles I. Koehlert
Patented Case
View Patent ↗
Granted: Mar 3, 1981
Filed: Mar 14, 1979
Inventors
Werner K. Priese
Charles I. Koehlert
Assignee (at issue)
Hills-McCanna 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.