Granted Patent
Utility
US 4,593,446 · App. 06/601,770
Method of manufacturing a fluid flow restrictor
Inventor:
Paul F. Hayner
Patented Case
View Patent ↗
Granted: Jun 10, 1986
Filed: Apr 18, 1984
Inventor
Paul F. Hayner
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.