Granted Patent
Utility
US 4,307,751 · App. 06/098,605
Plate valve
Inventors:
Thomas Mayer, John Story
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Nov 29, 1979
Inventors
Thomas Mayer
John Story
Assignee (at issue)
Edison International 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.