Granted Patent
Utility
US 5,020,533 · App. 07/268,558
Face mask with liquid and glare resistant visor
Inventors:
Vance M. Hubbard, Welton K. Brunson
Patented Case
View Patent ↗
Granted: Jun 4, 1991
Filed: Nov 8, 1988
Inventors
Vance M. Hubbard
Welton K. Brunson
Assignee (at issue)
Tecnol, 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.