Granted Patent
Utility
US 5,140,980 · App. 07/538,036
Hood mask and air filter system and method of manufacture thereof
Inventors:
John Haughey, Lisa H. Jackson
Patented Case
View Patent ↗
Granted: Aug 25, 1992
Filed: Jun 13, 1990
Inventors
John Haughey
Lisa H. Jackson
Assignee (at issue)
ILC Dover LP
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.