Patent US4690242A successfully refreshed from Google Patents.
US4690242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound actuated switch
Assignee: Individual
•
Filing: 1986-11-19
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Granted: 1987-09-01
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Expires: 2006-11-19
Abstract
Abstract A sound actuated detector comprising a microphone, an elastic cylinder having a flexible bottom adapted to fit tightly around the microphone with the sensing surface of the microphone fitting tightly against the flexible bottom, a mounting base connected to the surface of the cylinder having the flexible bottom, an elastic isolating medium arranged between the base and the surrounding surface to which the detector is attached, and a weight connected to the microphone having a mass such as to eliminate movement of the microphone in response to frequencies above a selected frequency.
Inventors
- 👤 David S. Mark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:29
CPC Classifications
G; G08; G08B; G08B15/00; G08B13/00; G08B13/16; G08B13/1654; G08B13/1672; Y; Y10; Y10S; Y10S200/00; Y10S200/20; Y10S362/00; Y10S362/802
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
83 words
A sound actuated detector comprising a microphone, a cylinder having a flexible membrane perpendicular to its axis, the cylinder being adapted to fit tightly around the microphone with the sensing surface of the microphone fitting tightly against the flexible membrane, means for affixing the cylinder to a surface at which sound is to be detected, and a weight connected to the cylinder having a mass such as to distort the flexible membrane of the cylinder in response to frequencies in a selected range.
Claim 2
Dependent Claim
83 words
A sound actuated detector comprising a microphone, a cylinder having a flexible membrane perpendicular to its axis, the cylinder being adapted to fit tightly around the microphone with the sensing surface of the microphone fitting tightly against the flexible membrane, means for affixing the cylinder to a surface at which sound is to be detected, and a weight connected to the cylinder having a mass such as to distort the flexible membrane of the cylinder in response to frequencies in a selected range.
Claim 3
Dependent Claim
20 words
A sound actuated detector as claimed in claim 1 further comprising means for hermetically sealing the microphone within the cylinder.
Claim 4
Dependent Claim
19 words
A sound actuated detector as claimed in claim 1 in which the cylinder is made of an elastic material.
Claim 5
Dependent Claim
29 words
A sound actuated detector as claimed in claim 1 in which the means for affixing the cylinder to a surface comprises an elastic base attached to the flexible membrane.
Claim 6
Dependent Claim
34 words
A sound actuated detector as claimed in claim 4 in which the elastic base has a smaller cross section at the surface which is attached to the flexible membrane than its general cross section.
Claim 7
Dependent Claim
26 words
A sound actuated detector as claimed in claim 1 further comprising means for isolating the surface at which sound is to be detected from its surroundings.
Claim 8
Dependent Claim
31 words
A sound actuated detector as claimed in claim 6 in which the means for isolating the surface from its surroundings comprises an elastic material arranged between the surface and its surroundings.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |