Granted Patent
Utility
US 4,376,642 · App. 06/241,517
Portable air cleaner unit
Inventor:
Nigel Verity
Patented Case
View Patent ↗
Granted: Mar 15, 1983
Filed: Mar 9, 1981
Inventor
Nigel Verity
Assignee (at issue)
Biotech Electronics Ltd.
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.