Granted Patent
Utility
US 4,291,877 · App. 06/109,718
Toy vehicle engine sound device
Inventors:
Burt Ensmann, Fredric M. Kuriloff, William Rosenhagen
Patented Case
View Patent ↗
Granted: Sep 29, 1981
Filed: Jan 4, 1980
Inventors
Burt Ensmann
Fredric M. Kuriloff
William Rosenhagen
Assignee (at issue)
Ideal Toy 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.