Granted Patent
Utility
US 4,859,375 · App. 06/946,828
Chemical refill system
Inventors:
Bruce A. Lipisko, John C. Schumacher, Richard E. Howard, Peter T. Randtke, Adrian Sandu, Robert E. Fletcher, Hans-Juergen Graf
Patented Case
View Patent ↗
Granted: Aug 22, 1989
Filed: Dec 29, 1986
Inventors
Bruce A. Lipisko
John C. Schumacher
Richard E. Howard
Peter T. Randtke
Adrian Sandu
Robert E. Fletcher
Hans-Juergen Graf
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.