Granted Patent
Utility
US 4,375,179 · App. 06/200,952
Action for electronic piano
Inventors:
Harold O. Schwartz, Ray F. Gong, Victor Durk
Patented Case
View Patent ↗
Granted: Mar 1, 1983
Filed: Oct 27, 1980
Inventors
Harold O. Schwartz
Ray F. Gong
Victor Durk
Assignee (at issue)
The Wurlitzer 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.