Granted Patent
Utility
US 4,861,420 · App. 07/073,675
Method of making a semiconductor transducer
Inventors:
James W. Knutti, Henry V. Allen, Kurt E. Petersen, Carl R. Kowalski
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Jul 14, 1987
Inventors
James W. Knutti
Henry V. Allen
Kurt E. Petersen
Carl R. Kowalski
Assignee (at issue)
Tactile Perceptions, Inc.
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.