Granted Patent
Utility
US 4,515,347 · App. 06/453,845
Valve seat structure
Inventors:
Willard J. Sitton, William L. Whaley
Patented Case
View Patent ↗
Granted: May 7, 1985
Filed: Dec 27, 1982
Inventors
Willard J. Sitton
William L. Whaley
Assignee (at issue)
Joy Manufacturing 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.