Granted Patent
Utility
US 4,964,432 · App. 07/495,162
Method and means for mounting valve member on valve stem
Inventor:
Alan F. Chou
Patented Case
View Patent ↗
Granted: Oct 23, 1990
Filed: Mar 19, 1990
Inventor
Alan F. Chou
Assignee (at issue)
Keystone International
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.