Granted Patent
Utility
US 5,193,991 · App. 07/663,316
Liquefied carbon dioxide pump
Inventors:
Douglas J. Koebler, Glen P. Williams
Patented Case
View Patent ↗
Granted: Mar 16, 1993
Filed: Mar 1, 1991
Inventors
Douglas J. Koebler
Glen P. Williams
Assignee (at issue)
Suprex Corporation
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.