Add-on module for a homogeneous unit telephone set

- Northern Telecom Limited
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Description

FIG. 1 is a front, top and right side perspective view of an add-on module for a homogeneous unit telephone set showing our new design;

FIG. 2 is a bottom plan view;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a front elevational view thereof; and

FIGS. 6 and 7 are respectively left and right side elevational views thereof.

Referenced Cited
U.S. Patent Documents
D219383 December 1970 Fox et al.
D232226 July 1974 Bee et al.
D236501 August 1975 Conway et al.
D251296 March 13, 1979 Haas
D276156 October 30, 1984 Goodin et al.
D287723 January 13, 1987 Kido
D293319 December 22, 1987 Matsuada et al.
D297535 September 6, 1988 Gagnon
D300028 February 28, 1989 To
D300029 February 28, 1989 Kido et al.
4773090 September 20, 1988 Goatman
Foreign Patent Documents
0129949 June 1986 JPX
Other references
  • Teleconnect Guide .COPYRGT.1985: Telecom System, p. 24; TIE/Comm. at p. 25; Items #76, #78; & #79. GTE Supply: Customer Premise Eqt.: Northern Telecom, Unity 20-Button Expansion Module at p. 59. Telephony, 9-10-82 Northern Telecom Logic System. CMC Brochure: Corporate Message Center Equip.: 5 Basic Components.
Patent History
Patent number: D306859
Type: Grant
Filed: Jan 6, 1989
Date of Patent: Mar 27, 1990
Assignee: Northern Telecom Limited (Montreal)
Inventors: Edmond J. Helstab (Ottawa), Michael Brown (Kanata)
Primary Examiner: Horace B. Fay, Jr.
Attorney: Robert C. Hogeboom
Application Number: 7/294,133
Classifications
Current U.S. Class: D14/241; Telephone Equipment (D14/240); Freestanding (5) (D14/149)