Granted Patent
Utility
US 5,850,183 · App. 08/393,878
Air filter restriction indicating device
Inventor:
Charles Henry Berry, III
Patented Case
View Patent ↗
Granted: Dec 15, 1998
Filed: Feb 24, 1995
Inventor
Charles Henry Berry, III
Assignee (at issue)
Engineered Products Company
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.