Granted Patent
Utility
US 4,488,004 · App. 06/363,421
Providing feature transparency between a plurality of PBXs
Inventors:
Frank J. Bogart, Mary R. Dedisse, Radhakrishna S. Divakaruni, Charles J. Fette, Keith S. Knight, Karen L. Page, Thornton S. Paxton
Patented Case
View Patent ↗
Granted: Dec 11, 1984
Filed: Mar 30, 1982
Inventors
Frank J. Bogart
Mary R. Dedisse
Radhakrishna S. Divakaruni
Charles J. Fette
Keith S. Knight
Karen L. Page
Thornton S. Paxton
Assignee (at issue)
AT&T Bell Laboratories
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.