Granted Patent
Utility
US 5,970,211 · App. 08/908,871
Portable vaporizer with cooling chamber
Inventors:
Kenneth A. Ritsher, Walter Birdsell, John Longan
Patented Case
View Patent ↗
Granted: Oct 19, 1999
Filed: Aug 8, 1997
Inventors
Kenneth A. Ritsher
Walter Birdsell
John Longan
Assignee (at issue)
Honeywell 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.