Granted Patent
Utility
US 4,842,827 · App. 06/948,120
Vacuum vapor transport control
Inventors:
Hans-Juergen Graf, Robert E. Fletcher, Peter T. Randtke, Bruce E. Rhine, J. R. Monkowski
Patented Case
View Patent ↗
Granted: Jun 27, 1989
Filed: Dec 30, 1986
Inventors
Hans-Juergen Graf
Robert E. Fletcher
Peter T. Randtke
Bruce E. Rhine
J. R. Monkowski
Assignee (at issue)
Air Products and Chemicals, 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.