Granted Patent
Utility
US 4,473,210 · App. 06/363,655
Labyrinth trim valve
Inventor:
John A. Brighton
Patented Case
View Patent ↗
Granted: Sep 25, 1984
Filed: Mar 30, 1982
Inventor
John A. Brighton
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.