Patent US4571579A successfully refreshed from Google Patents.
US4571579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swimming pool alarm
Assignee: Individual
•
Filing: 1984-02-13
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Granted: 1986-02-18
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Expires: 2004-02-13
Abstract
Abstract A swimming pool alarm consists of a sensor suspended beneath the water surface of the pool, including an electrical resonator element and a captive element agitatable by the pool water adjacent the resonator element, and an alarm device external of the pool which responds to the amplitude of resonance of the resonator element exceeding a certain level.
Inventors
- 👤 Edward N. Woolley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:37
CPC Classifications
G; G08; G08B; G08B21/00; G08B21/02; G08B21/08; G08B21/082
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
A swimming pool alarm comprising a sensor head for suspension in a swimming pool in a position submerged substantially beneath the water surface of the pool, the sensor head comprising an electrical resonator element housed within the head and means maintaining a movable element captive adjacent the resonator element, the movable element being agitatable responsive to movement of the watedr of the pool whereby to promote resonance of the resonator element, and an alarm device external of the pool and responsive to a predetermined amplitude of resonance of the resonator element.
Claim 2
Dependent Claim
91 words
A swimming pool alarm comprising a sensor head for suspension in a swimming pool in a position submerged substantially beneath the water surface of the pool, the sensor head comprising an electrical resonator element housed within the head and means maintaining a movable element captive adjacent the resonator element, the movable element being agitatable responsive to movement of the watedr of the pool whereby to promote resonance of the resonator element, and an alarm device external of the pool and responsive to a predetermined amplitude of resonance of the resonator element.
Claim 3
Independent Claim
13 words
A device according to 1, wherein the resonator element is a piezoelectric element.
Claim 4
Independent Claim
13 words
A device according to 1, wherein the resonator element is a piezoelectric element.
Claim 5
Dependent Claim
29 words
A device according to claim 2, wherein the resonator element is housed in a cavity in the transducer head in free communication with the water of the swimming pool.
Claim 6
Dependent Claim
27 words
A device according to claim 3, wherein the cavity is resonant, when filled with water, at a frequency approximately the same as that of the resonator element.
Claim 7
Dependent Claim
31 words
A device according to claim 3, wherein the movable element is enclosed in the cavity, the movable element being freely agitatable in response to the movement of water in the cavity.
Claim 8
Dependent Claim
24 words
A device according to claim 3, wherein the resonator element is a piezoelectric ceramic disc having one surface forming a wall of the cavity.
Claim 9
Dependent Claim
23 words
A device according to claim 3, wherein the resonator element is a piezoelectric ceramic plate anchored at one end to the transducer head.
Claim 10
Dependent Claim
17 words
A device according to claim 1, wherein the resonant frequency of the resonator element is 40-200 KHz.
Claim 11
Dependent Claim
94 words
A swimming pool alarm comprising a triggerable alarm device, a transducer head incorporatinig a high Q resonator element having an ultrasonic resonant frequency and submersible in a swimming pool, and means sensitive to the amplitude of the resonance of the element and operative to trigger the alarm device, the resonator element being housed in a cavity in the transducer head in free communication with the water of the swimming pool, and a movable element being enclosed in the cavity, the movable element being freely agitatable in response to movement of water in the cavity.
Claim 12
Dependent Claim
94 words
A swimming pool alarm comprising a triggerable alarm device, a transducer head incorporatinig a high Q resonator element having an ultrasonic resonant frequency and submersible in a swimming pool, and means sensitive to the amplitude of the resonance of the element and operative to trigger the alarm device, the resonator element being housed in a cavity in the transducer head in free communication with the water of the swimming pool, and a movable element being enclosed in the cavity, the movable element being freely agitatable in response to movement of water in the cavity.
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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) | 1989-02-17 | 1989-08-19 | 1990-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-17 | 1993-08-19 | 1994-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-17 | 1997-08-19 | 1998-02-18 | $7700.00 | Window Closed / Lapsed |