Granted Patent
Utility
US 4,449,437 · App. 06/304,404
Automatic piano
Inventors:
Robert B. Cotton, Jr., Dale M. Uetrecht
Patented Case
View Patent ↗
Granted: May 22, 1984
Filed: Sep 21, 1981
Inventors
Robert B. Cotton, Jr.
Dale M. Uetrecht
Assignee (at issue)
Baldwin Piano & Organ Company
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.