Granted Patent
Utility
US 4,969,457 · App. 07/415,044
Body fluids barrier mask
Inventors:
Vance M. Hubbard, Welton K. Brunson, Darrell S. Caldwell
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Sep 29, 1989
Inventors
Vance M. Hubbard
Welton K. Brunson
Darrell S. Caldwell
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.