Granted Patent
Utility
US 4,659,899 · App. 06/833,575
Vacuum-compatible air-cooled plasma device
Inventors:
David G. Welkie, Robert L. Gerlach
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: Feb 26, 1986
Inventors
David G. Welkie
Robert L. Gerlach
Assignee (at issue)
PerkinElmer, Inc.
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.