Granted Patent
Utility
US 4,262,688 · App. 06/042,394
Metal seat assemblies for valves
Inventor:
Ludwik S. Bialkowski
Patented Case
View Patent ↗
Granted: Apr 21, 1981
Filed: May 25, 1979
Inventor
Ludwik S. Bialkowski
Assignee (at issue)
ACF Industries Incorporated
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.