Granted Patent
Utility
US 4,283,929 · App. 06/057,979
Coded automatic counterbalance control
Inventor:
Francis E. Heiberger
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: Jul 16, 1979
Inventor
Francis E. Heiberger
Assignee (at issue)
Danly Machine Corporation
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.