Granted Patent
Utility
US 5,231,671 · App. 07/719,195
Method and apparatus for generating vocal harmonies
Inventors:
Brian Gibson, John P. Bertsch
Patented Case
View Patent ↗
Granted: Jul 27, 1993
Filed: Jun 21, 1991
Inventors
Brian Gibson
John P. Bertsch
Assignee (at issue)
IVL Technologies Ltd.
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.