Granted Patent
Utility
US 4,194,297 · App. 05/864,305
Method and apparatus for generating a controllably exposed vapor body for heating articles
Inventor:
Robert C. Pfahl, Jr.
Patented Case
View Patent ↗
Granted: Mar 25, 1980
Filed: Dec 27, 1977
Inventor
Robert C. Pfahl, Jr.
Assignee (at issue)
Western Electric Company, 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.