Granted Patent
Utility
US 5,319,634 · App. 07/773,009
Multiple access telephone extension systems and methods
Inventors:
David Bartholomew, A. Ray Ivie, Alma K. Schurig
Patented Case
View Patent ↗
Granted: Jun 7, 1994
Filed: Oct 7, 1991
Inventors
David Bartholomew
A. Ray Ivie
Alma K. Schurig
Assignee (at issue)
Phoenix, LLC
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.