Granted Patent
Utility
US 5,440,643 · App. 08/062,422
Audio peripheral mixer circuit and method for noise reduction
Inventors:
David F. Wilson, Lawrence F. Heyl
Patented Case
View Patent ↗
Granted: Aug 8, 1995
Filed: May 13, 1993
Inventors
David F. Wilson
Lawrence F. Heyl
Assignee (at issue)
Apple Computer 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.