Granted Patent
Utility
US 4,883,146 · App. 07/292,294
Descent control device with deadman brake
Inventors:
Horace M. Varner, Ernest L. Stech
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Dec 30, 1988
Inventors
Horace M. Varner
Ernest L. Stech
Assignee (at issue)
Frost Engineering Development Corp.
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.