Electronic intercommunication unit

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Description

FIG. 1 is a front elevational view of an electronic intercommunication unit showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and

FIG. 7 is a front, top and side perspective view thereof.

The door-phone box of the present design may be used as installed, for example, on a wall at a building entrance or the like in combination with a multifunctional telephone set, so that a manual pressing of the operating button will produce at the telephone set a chime sound of a visitor's calling and a conversation may be made between the door-phone box in the exterior and the telephone set in the interior of a building.

Referenced Cited
U.S. Patent Documents
D174406 April 1955 Adler
D199677 December 1964 Mattingly
D210026 January 1968 Kahn
D211092 May 1968 Kahn
D255444 June 17, 1980 Houlihan
D255901 July 15, 1980 Tokiyama
D259422 June 2, 1981 Taylor
D264716 June 1, 1982 Nakajima
D274518 July 3, 1984 Doodson
D275101 August 14, 1984 Read
Other references
  • Talk-O-Products Brochure "Intercommunication Systems": pp. 3-5.
Patent History
Patent number: D279471
Type: Grant
Filed: Apr 29, 1983
Date of Patent: Jul 2, 1985
Assignee: Nippon Tsushin Kogyo Kabushiki Kaisha (Kanagawa)
Inventor: Suemitsu Nakashima (Kawasaki)
Primary Examiner: Wallace R. Burke
Assistant Examiner: Horace B. Fay
Law Firm: Burns, Doane, Swecker & Mathis
Application Number: 6/490,134
Classifications
Current U.S. Class: D14/58; D14/52; D14/92