Granted Patent
Utility
US 4,485,996 · App. 06/337,502
Height adjustor for furniture
Inventors:
Duane M. Beukema, Jack R. Knoblauch
Patented Case
View Patent ↗
Granted: Dec 4, 1984
Filed: Jan 6, 1982
Inventors
Duane M. Beukema
Jack R. Knoblauch
Assignee (at issue)
Steelcase 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.