Telephone amplifier

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Description

FIG. 1 is a top plan view of a telephone amplifier showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevational view thereof.

Referenced Cited
U.S. Patent Documents
D243536 March 1, 1977 van de Poel
D244209 May 3, 1977 Bliven
D247174 February 7, 1978 Vanda
D261761 November 10, 1981 Ingber et al.
D261764 November 10, 1981 Klucznik
D275752 October 2, 1984 Mahan
D275753 October 2, 1984 Mahan
D280463 September 10, 1985 Mitchell
D282166 January 14, 1986 Yuen
D282179 January 14, 1986 Yuen
3469336 September 1969 Halperin
Other references
  • Post Office Electrical Eng. Journal (Gr. Britain, Vol. 74, Oct. 1981: Article re Customer Apparatus: Fig. 3, at p. 239-"Doric" Loud Speaker.
Patent History
Patent number: D286635
Type: Grant
Filed: Jul 16, 1984
Date of Patent: Nov 11, 1986
Assignee: John Manufacturing Limited (Kowloon)
Inventor: John S. Yuen (Kowloon)
Primary Examiner: Wallace R. Burke
Assistant Examiner: Horace B. Fay
Law Firm: Beall Law Offices
Application Number: 6/631,400
Classifications
Current U.S. Class: D14/57; D14/60; D14/92; D14/52; D14/59