Granted Patent
Utility
US 4,960,121 · App. 07/027,567
Half-face mask assembly
Inventors:
James E. Nelson, Valentine A. Castro, Noemi Esparza
Patented Case
View Patent ↗
Granted: Oct 2, 1990
Filed: Mar 18, 1987
Inventors
James E. Nelson
Valentine A. Castro
Noemi Esparza
Assignee (at issue)
Figgie Inernational 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.