Granted Patent
Utility
US 5,640,844 · App. 08/451,944
Pressurization and control devices using high vapor pressure liquids
Inventor:
Donald A. Pahl
Patented Case
View Patent ↗
Granted: Jun 24, 1997
Filed: May 26, 1995
Inventor
Donald A. Pahl
Assignee (at issue)
Primer Technologies, 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.