Granted Patent
Utility
US 4,924,936 · App. 07/082,011
Multiple, parallel packed column vaporizer
Inventor:
Clem S. McKown
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: Aug 5, 1987
Inventor
Clem S. McKown
Assignee (at issue)
M&T 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.