Power pack with concealed radio transmitter for portable cellular telephone

• US 5,001,772 A
• Filed: 11/17/1989
• Issued: 03/19/1991
• Est. Priority Date: 11/17/1989
• Status: Expired due to Term

• Current Assignee: Round Rock Research LLC
• Original Assignee: Jack N. Holcomb
• Inventors: Pangratz, Konrad K., Holcomb, Jack N.
• Primary Examiner(s): KUNTZ, CURTIS A
• Application Number:
  US07/437,599
• Time in Patent Office: 487 Days
• Field of Search: 455/89, 455/90, 455/127, 455/343, 361/399, 361/422, 361/415, 320/2, 320/5, 320/13, 320/14
• US Class Current: 455/575.1
• CPC Class Codes: H04B 1/3883 Arrangements for mounting batteries or battery chargers
• CPC Class Codes: H04M 1/0262 for a battery compartment

Abstract

The present power pack for a portable cellular telephone has a concealed radio transmitter for law enforcement use. The usual battery compartment in the housing of the power pack has a shortened battery compartment above which are located interior walls of the housing which are notched or recessed to support a printed circuit board carrying a radio transmitter. The housing has a shallow recess on the inside in which an antenna is potted. A space inside the housing receives a microphone for the radio transmitter. An opening near the lower end of the housing receives a push button switch for powering the transmitter from batteries in the shortened battery compartment.

Claims

1. A power pack for a portable cellular telephone, said power pack comprising:

an elongated housing attachable to the portable cellular telephone, said housing having lower and upper ends and being elongated between said ends, said housing having an inner member adapted to extend next to the cellular telephone and an outer wall on the opposite side from said inner member, said housing having openings in said outer wall at its lower end and having a battery compartment extending up from said openings, said housing having a lower interior wall extending transverse to said outer wall at the upper end of said battery compartment and an upper interior wall spaced above said lower interior wall and extending transverse to said outer wall, said lower and upper interior walls having respective recesses which are aligned with each other in the direction of elongation of said housing and are spaced from said outer wall toward said inner member of the housing to receive and support a radio transmitter circuit board, said outer wall of the housing having a shallow recess on the inside extending up from said battery compartment past said lower interior wall, said housing defining a space above said upper interior wall between said inner member and said outer wall, and said inner member of the housing having an air passage therein which opens into said space;

a microphone in said space;

an antenna in said shallow recess on the inside of said outer wall of the housing, potting material embedding said antenna in said recess;

a radio transmitter circuit board mounted in said recesses in said upper and lower interior walls;

wiring inside said housing electrically connecting said radio transmitter circuit board to said microphone and said antenna;

and a push button switch in one of said openings in said outer wall of the housing near its lower end selectively operable to electrically connect batteries in said battery compartment to said transmitter circuit board.

2. A power pack according to claim 1 wherein said lower and upper interior walls of said housing are recessed on the side toward said inner member of the housing.

3. A power pack according to claim 2 wherein said housing has an outer housing member providing said outer wall and having opposite side walls extending from said outer wall to said inner member.

4. In a power pack for a portable cellular telephone, said power pack comprising a housing attachable to the cellular telephone and having a battery compartment extending up along the inside of said housing, an upper interior wall spaced above said battery compartment, and a space located above said upper interior wall, the improvement wherein:

said upper interior wall has an exposed edge with a wide recess therein;

said housing has a lower interior wall spaced below said upper interior wall and defining the upper end of a shortened battery compartment in the housing, said lower interior wall having an exposed edge with a wide recess therein which is aligned with said recess in said upper interior wall;

and said housing has a shallow recess on the inside near said upper and lower interior walls;

said improvement further comprising;

a printed circuit board having a radio transmitter thereon seated in said wide recesses in said upper and lower interior walls of the housing;

an antenna seated in said shallow recess on the inside of the housing;

a microphone in said space in said housing above said upper interior wall;

and wiring electrically connecting said transmitter to said antenna and said microphone.

5. A power pack according to claim 4 wherein said housing has openings at the lower end of said battery compartment, and said improvement further comprises:

a push button switch in one of said openings for energizing said transmitter from batteries in said shortened battery compartment in the housing.