Granted Patent
Utility
US 4,797,062 · App. 07/111,150
Device for moving gas at subatmospheric pressure
Inventors:
Ludger A. Deters, Heinrich Engländer, Hans-Peter Kabelitz, Gunter Schutz
Patented Case
View Patent ↗
Granted: Jan 10, 1989
Filed: Oct 20, 1987
Inventors
Ludger A. Deters
Heinrich Engländer
Hans-Peter Kabelitz
Gunter Schutz
Assignee (at issue)
Leybold-Heraeus GmbH
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.