Granted Patent
Utility
US 4,629,482 · App. 06/762,345
HEPA room air purifier
Inventor:
George B. Davis, Jr.
Patented Case
View Patent ↗
Granted: Dec 16, 1986
Filed: Aug 5, 1985
Inventor
George B. Davis, Jr.
Assignee (at issue)
Enviracaire 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.