Granted Patent
Utility
US 4,478,174 · App. 06/580,229
Vacuum coating vessel with movable shutter plate
Inventor:
Martial Ranger
Patented Case
View Patent ↗
Granted: Oct 23, 1984
Filed: Feb 15, 1984
Inventor
Martial Ranger
Assignee (at issue)
Canadian Patents and Development Limited
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.