Telephone handset amplifier

The ornamental design for a telephone handset amplifier, as shown.

FIG. 1 is a front perspective view of a telephone handset amplifier showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a front elevational view thereof.

Patent	Priority	Assignee	Title
D326267,	Dec 07 1989		Portable telephone amplifier unit
D626953,	Jan 05 2010	Wilson Electronics, LLC	Sleek amplifier case
D689476,	Jun 28 2012		Phone stand with speaker amplifier

Patent	Priority	Assignee	Title
2214992,
3254160,
3277243,
4151376,	Jan 24 1977	Plantronics, Inc	Amplifier for telephone handset
4160122,	May 23 1978		Telephone earphone amplifier
4191861,	Jan 24 1977	Plantronics, Inc	Telephone amplifier
190585,
211251,
225750,

Executed on	Assignor	Assignee	Conveyance	Frame	Reel	Doc
Apr 30 1979		Proctor & Associates Company	(assignment on the face of the patent)

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