Granted Patent
Utility
US 4,889,319 · App. 07/202,692
Bakeable vacuum systems
Inventors:
Robert B. Phillips, Paul R. Stonestreet
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Jun 3, 1988
Inventors
Robert B. Phillips
Paul R. Stonestreet
Assignee (at issue)
VG Instruments Group 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.