USRE30620E
Expired / Lapsed
US
⏱️ 0.0 years remaining
High output smoke and heat detector alarm system utilizing a piezoelectric transducer and a voltage doubling means
Assignee: Duracell Inc USA
•
Filing: 1978-07-03
•
Granted: 1981-05-19
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Expires: 1998-07-03
Abstract
Abstract A high output smoke and heat detector alarm system comprises a high output audible alarm means which includes a piezoelectric transducer and a voltage doubling means in combination with an improved smoke and heat detector which includes a low voltage power supply source, an ambient temperature detecting means, at least one ionization sensing chamber, a voltage amplitude comparing means, and a low voltage sensing means.
Inventors
- 👤 Louis P. Sweany
- 👤 Michael T. Burk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:13
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/11; G08B17/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
22 words
includes a relaxation oscillator and a zener diode..]. .[.6. The smoke and heat detector as recited in claim 5 wherein said relaxation
Claim 2
Dependent Claim
86 words
oscillation includes a programmable unijunction transistor..]. 7. A high output smoke .[.and heat.]. detector alarm system comprising, in combination, a smoke .[.and heat.]. detector which includes a low voltage power supply source, .[.an ambient temperature detecting means,.]. and at least one ionization sensing chamber; and a high output audible alarm means responsive to said smoke .[.and heat.]. detector .Iadd.and .Iaddend.which includes a piezoelectric transducer and a voltage .[.double.]. .Iadd.doubling .Iaddend.means whereby a voltage is supplied to said piezoelectric transducer which is double said power supply source
Claim 3
Dependent Claim
43 words
voltage. 8. The alarm system as recited in claim 7 wherein said smoke .[.and heat.]. detector further includes a voltage amplitude comparing means electrically coupled to said ionization sensing chamber and said power supply source and a low voltage sensing means electrically coupled
Claim 4
Dependent Claim
24 words
to said power supply source. 9. The alarm system as recited in claim 8 wherein said low voltage sensing means includes a relaxation oscillator
Claim 5
Dependent Claim
15 words
and a zener diode. 10. The alarm system as recited in claim 9 wherein said
Claim 6
Dependent Claim
23 words
voltage amplitude comparing means is a schmitt trigger. 11. The alarm system as recited in claim 10 wherein said schmitt trigger includes a
Claim 7
Dependent Claim
46 words
field effect transistor and a bipolar transistor. 12. The alarm system as recited in claim 7 wherein said high output audible alarm means further includes a pulsator means electrically coupled to an output of said smoke .[.and heat.]. detector and an oscillator means electrically coupled to
Claim 8
Dependent Claim
24 words
said pulsator means. 13. The alarm system as recited in claim 12 wherein said pulsator means and said oscillator means comprise a Quad two-input
Claim 9
Dependent Claim
34 words
NAND gate integrated circuit. 14. The alarm system as recited in claim 13 further comprising a logic driving means responsive to said smoke .[.and heat.]. detector for driving said Quad two-input NAND gate integrated
Claim 10
Dependent Claim
12 words
circuit. 15. The alarm system as recited in claim 13 wherein said
Claim 11
Dependent Claim
68 words
piezoelectric electric transducer includes three electrodes. 16. The alarm system as recited in claim 15 wherein said voltage doubling means includes at least two bipolar buffer amplifiers one of which is electrically coupled to a first output of said oscillator means and a first electrode of said piezoelectric transducer and another of which is electrically coupled to a second output of said oscillator means and a second electrode
Claim 12
Dependent Claim
21 words
of said piezoelectric transducer. 17. The alarm system as recited in claim 7 further comprising an acoustics enhancement means acoustically coupled
Claim 13
Dependent Claim
21 words
to said piezoelectric transducer. 18. The alarm system as recited in claim 17 wherein said acoustics enhancement means includes an aperture
Claim 14
Dependent Claim
31 words
termination in spaced relation to said piezoelectric transducer. 19. The alarm system as recited in claim 18 wherein said acoustics enhancement means further includes a resonant cavity coupled to said piezoelectric
Claim 15
Dependent Claim
27 words
transducer. 20. The alarm system as recited in claim 19 wherein said acoustics enhancement means further includes a single wavelength baffle acoustically coupled to said resonant 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) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |