Granted Patent
Utility
US 4,557,192 · App. 06/266,789
Self restoring pivoting means and print hammer using same
Inventor:
William L. Dollenmayer
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: May 26, 1981
Inventor
William L. Dollenmayer
Assignee (at issue)
International Business Machines 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.