Granted Patent
Utility
US 4,990,750 · App. 07/438,817
Independently powered safety device
Inventors:
Thomas J. Martel, John S. Sklenak
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Nov 9, 1989
Inventors
Thomas J. Martel
John S. Sklenak
Assignee (at issue)
Raytheon 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.