Granted Patent
Utility
US 4,446,009 · App. 06/260,145
Selective vaporization process and apparatus
Inventor:
David B. Bartholic
Patented Case
View Patent ↗
Granted: May 1, 1984
Filed: May 4, 1981
Inventor
David B. Bartholic
Assignee (at issue)
Engelhard 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.