Granted Patent
Utility
US 4,248,407 · App. 06/106,088
Cast house emissions recycle system
Inventor:
Frank K. Armour
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: Dec 21, 1979
Inventor
Frank K. Armour
Assignee (at issue)
The Interlake Companies, 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.