Granted Patent
Utility
US 6,003,552 · App. 09/114,958
Rocker valve for sealing large orifices
Inventors:
John R. Shank, Peter A. Holborow, William G. Reeson
Patented Case
View Patent ↗
Granted: Dec 21, 1999
Filed: Jul 13, 1998
Inventors
John R. Shank
Peter A. Holborow
William G. Reeson
Assignee (at issue)
Automatic Switch 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.