IP Library Granted Patent US 5,338,003
Granted Patent Utility
US 5,338,003 · App. 07/889,792

Dual seal ball valve

Inventor: John Beson
Patented Case View Patent ↗
Granted: Aug 16, 1994 Filed: May 28, 1992
Inventor
John Beson

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.

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Quick Facts
Patent No.
US 5,338,003
App. No.
07/889,792
Filed
1992-05-28
Granted
1994-08-16
Kind
A