Patent US3665259A successfully refreshed from Google Patents.
US3665259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration transducer for burglar alarms and the like
Assignee: Brailsford and Co Inc
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Filing: 1970-08-19
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Granted: 1972-05-23
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Expires: 1990-08-19
Abstract
Abstract A sensing device constructed on a support to be attached to a safe or the like and having an electrical signal generator, such as a piezoelectric crystal, rigidly attached to the support at one end and freely movable at the other end to generate a voltage in response to vibrations of the safe. A feedback amplifier amplifies this voltage to produce a resultant output signal for connection to an alarm. The amplifier includes input and output stages and a controllable positive feedback loop to provide a two-terminal replacement for a carbon granule transducer.
Inventors
- 👤 Harrison D Brailsford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:07
CPC Classifications
G; G01; G01H; G01H11/00; G01H11/06; G01H11/08; G08; G08B; G08B13/00; G08B13/16; G08B13/1654
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
79 words
A sensing device for connection to a pair of terminals of an alarm system, said sensing device comprising: A. A support; B. An elongated vibratory member having one end attached to said support, the other end of said vibratory member being free to move with respect to Said support; C. Electrical signal generating means cooperating with said vibratory member to generate an electrical signal when said vibratory member moves relative to said support; and D. A feedback amplifier comprising:
Claim 2
Dependent Claim
79 words
A sensing device for connection to a pair of terminals of an alarm system, said sensing device comprising: A. A support; B. An elongated vibratory member having one end attached to said support, the other end of said vibratory member being free to move with respect to Said support; C. Electrical signal generating means cooperating with said vibratory member to generate an electrical signal when said vibratory member moves relative to said support; and D. A feedback amplifier comprising:
Claim 3
Dependent Claim
17 words
A first transistor stage having an output circuit and an input circuit connected to said generating means,
Claim 4
Dependent Claim
17 words
A first transistor stage having an output circuit and an input circuit connected to said generating means,
Claim 5
Dependent Claim
30 words
An output transistor stage having an input circuit connected to the output circuit of said first transistor stage and having an output circuit connected to said pair of terminals, and
Claim 6
Dependent Claim
30 words
An output transistor stage having an input circuit connected to the output circuit of said first transistor stage and having an output circuit connected to said pair of terminals, and
Claim 7
Dependent Claim
30 words
An output transistor stage having an input circuit connected to the output circuit of said first transistor stage and having an output circuit connected to said pair of terminals, and
Claim 8
Dependent Claim
30 words
An output transistor stage having an input circuit connected to the output circuit of said first transistor stage and having an output circuit connected to said pair of terminals, and
Claim 9
Dependent Claim
65 words
The sensing device of claim 1 in which one end of said potentiometer is connected to the collector of said output stage and said feedback amplifier comprises: A. A load impedance connected in series between the collector of said input stage and the collector of said output stage; and B. A common load impedance having a terminal connected to the collector of said output stage.
Claim 10
Dependent Claim
85 words
A feedback control connected between said input transistor stage and said output transistor stage to control the gain of said amplifier by controlling the feedback, said output stage and said input stage having their respective output circuits connected together to be connected to a common output impedance wherein said feedback control comprises a potentiometer having its ends connected directly in parallel with said output circuits of said output transistor stage, the arm of said potentiometer being connected to the base of said output transistor stage.
Claim 11
Dependent Claim
85 words
A feedback control connected between said input transistor stage and said output transistor stage to control the gain of said amplifier by controlling the feedback, said output stage and said input stage having their respective output circuits connected together to be connected to a common output impedance wherein said feedback control comprises a potentiometer having its ends connected directly in parallel with said output circuits of said output transistor stage, the arm of said potentiometer being connected to the base of said output transistor stage.
Claim 12
Dependent Claim
85 words
A feedback control connected between said input transistor stage and said output transistor stage to control the gain of said amplifier by controlling the feedback, said output stage and said input stage having their respective output circuits connected together to be connected to a common output impedance wherein said feedback control comprises a potentiometer having its ends connected directly in parallel with said output circuits of said output transistor stage, the arm of said potentiometer being connected to the base of said output transistor stage.
Claim 13
Dependent Claim
85 words
A feedback control connected between said input transistor stage and said output transistor stage to control the gain of said amplifier by controlling the feedback, said output stage and said input stage having their respective output circuits connected together to be connected to a common output impedance wherein said feedback control comprises a potentiometer having its ends connected directly in parallel with said output circuits of said output transistor stage, the arm of said potentiometer being connected to the base of said output transistor stage.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |