Granted Patent
Utility
US 4,949,809 · App. 07/447,194
Extendable pole locking mechanism for ladder stabilizer
Inventors:
Avraham Y. Levi, Craig D. Quarberg
Patented Case
View Patent ↗
Granted: Aug 21, 1990
Filed: Dec 7, 1989
Inventors
Avraham Y. Levi
Craig D. Quarberg
Assignee (at issue)
A/C INNOVATIONS, LLC
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.