IP Library Granted Patent US 8,175,313
Granted Patent B2
US 8,175,313 · App. 11/967,689 · Granted May 8, 2012

Electronic anti-sabotage microphone grommet

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Quick Facts
Patent No.
US 8,175,313
App. No.
11/967,689
Granted
May 8, 2012
Kind
B2
Abstract

A tamper detection apparatus includes a housing defining an internal cavity. A sensing device embodied as a microphone is positioned within the internal cavity of the housing, which may also be a protective grommet. A conductive element spans the internal cavity and is positioned in front of the microphone. The conductive element initiates a fault signal when a specified electrical condition is met to indicate a tampering or an attempted tampering with the microphone.

Claims (36)

1. A tamper detection apparatus, comprising:

a housing defining an internal cavity;

a sensing device positioned within the internal cavity of the housing; and

a conductive element spanning the internal cavity and positioned in front of the sensing device,

wherein the conductive element transmits an electrical signal to indicate a tampering attempt.

2. The apparatus of claim 1 , wherein the sensing device is a microphone.

3. The apparatus of claim 1 , wherein the housing is a grommet.

4. The apparatus of claim 1 ,

wherein the conductive element is electrically connected to a power source and a control device, and

wherein the conductive element transmitting an electrical signal to indicate a tampering attempt includes the conductive element initiating a remote fault signal at the control device when a specified electrical condition is met.

5. The apparatus of claim 1 , wherein the specified electrical condition includes an open circuit.

6. The apparatus of claim 1 , wherein the specified electrical condition includes a closed circuit.

7. The apparatus of claim 1 , wherein the specified electrical condition is met when the conductive element is punctured.

8. The apparatus of claim 1 , wherein the conductive element is a membrane.

9. The apparatus of claim 1 , wherein the conductive element includes a conductive mesh material.

10. The apparatus of claim 1 , wherein the conductive element includes a conductive coating.

11. The apparatus of claim 1 , wherein the conductive element is substantially transparent acoustically.

12. A microphone grommet, comprising:

an enclosure having an internal cavity, the internal cavity dimensioned to receive an input end of the microphone therein; and

a conductive element integral with the enclosure spanning the internal cavity across the input end of the microphone,

wherein the conductive element transmits an electrical signal to indicate a tampering attempt.

13. The microphone grommet of claim 12 , wherein the conductive element is electrically connected to a power source and a control device, and

wherein the conductive element transmitting an electrical signal to indicate a tampering attempt includes the conductive element initiating a remote fault signal at the control device when a specified electrical condition is met.

14. The microphone grommet of claim 12 , wherein the enclosure comprises a plastic material.

15. The microphone grommet of claim 12 , wherein the plastic material comprises neoprene.

16. The microphone grommet of claim 12 , wherein the enclosure further comprises an acoustic cavity.

17. The microphone grommet of claim 12 , wherein the acoustic cavity extends from a first end of the enclosure to the conductive element.

18. A glassbreak detector comprising:

a microphone;

a protective grommet fitting over an input end of the microphone, the protective grommet comprising:

a grommet enclosure having an internal cavity, the internal cavity dimensioned to receive the input end of the microphone therein;

a conductive element integral with the enclosure spanning the internal cavity across the input end of the microphone; and

an outer enclosure surrounding the microphone and the protective grommet,

wherein the conductive element transmits an electrical signal to a tampering attempt.

19. The glassbreak detector according to claim 18 , wherein the outer enclosure has an opening to admit sound to the microphone.

20. The glassbreak detector according to claim 18 , wherein the grommet enclosure further comprises a first acoustic cavity extending from a first end of the grommet enclosure to the conductive element.

Assignments (5)
CHANGE OF NAME Recorded Jun 12, 2025
From: ADEMCO INC.
To: RESIDEO LLC
Reel/Frame 071546/0001 →
CORRECTIVE ASSIGNMENT TO CORRECT THE PREVIOUS RECORDING BY NULLIFICATION. THE INCORRECTLY RECORDED PATENT NUMBERS 8545483, 8612538 AND 6402691 PREVIOUSLY RECORDED AT REEL: 047909 FRAME: 0425. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Recorded Jun 12, 2019
From: HONEYWELL INTERNATIONAL INC.
To: ADEMCO INC.
Reel/Frame 050431/0053 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 14, 2018
From: HONEYWELL INTERNATIONAL INC.
To: ADEMCO INC.
Reel/Frame 047909/0425 →
SECURITY INTEREST Recorded Oct 26, 2018
From: ADEMCO INC.
To: JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT
Reel/Frame 047337/0577 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 20, 2008
From: PIEL, KEVIN G.; ADONAILO, ROBERT S.; ORLANDO, ROBERT J.
To: HONEYWELL INTERNATIONAL, INC.
Reel/Frame 020678/0531 →