Granted Patent
Utility
US 4,738,528 · App. 07/033,569
Pyrometer vortex purge air cleaning system with center masked pyrometer lens
Inventor:
Donald W. Craft
Patented Case
View Patent ↗
Granted: Apr 19, 1988
Filed: Apr 3, 1987
Inventor
Donald W. Craft
Assignee (at issue)
General Electric Company
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.