Granted Patent
Utility
US 4,809,331 · App. 06/927,721
Apparatus and methods for speech analysis
Inventor:
John Holmes
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Nov 7, 1986
Inventor
John Holmes
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.