Granted Patent
Utility
US 4,430,770 · App. 06/306,314
Door operating mechanism
Inventors:
Frank M. Niekrasz, Matthew Rolek
Patented Case
View Patent ↗
Granted: Feb 14, 1984
Filed: Sep 28, 1981
Inventors
Frank M. Niekrasz
Matthew Rolek
Assignee (at issue)
Ardco, 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.