Patent US3842409A successfully refreshed from Google Patents.
US3842409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ionization detector apparatus
Assignee: Unitec Inc
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Filing: 1972-12-13
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Granted: 1974-10-15
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Expires: 1992-12-13
Abstract
Abstract A fire warning apparatus incorporating an ion detector which generates an output in the presence of a fire. A pulse generation circuit emits a time sequence of pulses and applies them simultaneously to the signal level detector circuit and to a pulse counter circuit. If the ion detector has an output which is indicative of a fire, the signal level detector operates to suppress the pulses being applied by the signal level detector to the pulse counter circuit. The pulses being applied directly to the counter circuit will be transmitted through the circuit operating the alarm system. Special circuits are included to provide a visual indication of operability of the electronic circuit and for disabling the pulse generator to provide a continuously visual alarm.
Inventors
- 👤 R Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:26
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/11; G08B17/113
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
142 words
A fire warning apparatus, comprising: a. an ionization detector means, b. a gate means connected to said ionization detector means, c. signal level detector means connected to said gate means, d. pulse generator means having its output connected to said gate means, e. pulse counter means having an output and first and second input means, said first input means connected to the output of said signal level detector means and said second input means connected to said pulse generator means, said pulse counter means generating an output when a signal from said detector means has passed through said gate to said first input means, and said pulse means has applied a predetermined number of pulses to said second input means, f. alarm means connected to the output of said pulse counter means and responsive to said output from said pulse counter means.
Claim 2
Dependent Claim
142 words
A fire warning apparatus, comprising: a. an ionization detector means, b. a gate means connected to said ionization detector means, c. signal level detector means connected to said gate means, d. pulse generator means having its output connected to said gate means, e. pulse counter means having an output and first and second input means, said first input means connected to the output of said signal level detector means and said second input means connected to said pulse generator means, said pulse counter means generating an output when a signal from said detector means has passed through said gate to said first input means, and said pulse means has applied a predetermined number of pulses to said second input means, f. alarm means connected to the output of said pulse counter means and responsive to said output from said pulse counter means.
Claim 3
Dependent Claim
31 words
A fire warning apparatus as described in claim 1, including; a. means for applying said output from said counter means to said pulse generating means thereby de-activating said generating pulse means.
Claim 4
Dependent Claim
33 words
A fire warning apparatus as described in claim 1, including; a. a visible indicator means connected to the output of said signal level detector means to indicate operability of said fire warning apparatus.
Claim 5
Dependent Claim
21 words
A fire warning apparatus as described in claim 1, wherein; a. said gate means comprising a junction field effect transistor member.
Claim 6
Dependent Claim
128 words
An ion detector output circuit, comprising; a. first and second ion detectors generally connected between a source of voltage and ground, b. a junctive field effect transistor having its input connected to the junction between said first and second ion detectors, c. a metal oxide semi-conductor, d. a pulse generator, e. voltage adjustable means connected between a source of voltage and an output of said pulse generator to the input of said metal oxide semi-conductor, and f. means for connecting the output of said Junction field effect transistor across said voltage adjustable means, whereby the voltage at the output of said junction field effect transistor can be adjusted to equal the voltage of said ion detectors and adjustable to match the threshold voltage of said metal oxide semi-conductor.
Claim 7
Dependent Claim
128 words
An ion detector output circuit, comprising; a. first and second ion detectors generally connected between a source of voltage and ground, b. a junctive field effect transistor having its input connected to the junction between said first and second ion detectors, c. a metal oxide semi-conductor, d. a pulse generator, e. voltage adjustable means connected between a source of voltage and an output of said pulse generator to the input of said metal oxide semi-conductor, and f. means for connecting the output of said Junction field effect transistor across said voltage adjustable means, whereby the voltage at the output of said junction field effect transistor can be adjusted to equal the voltage of said ion detectors and adjustable to match the threshold voltage of said metal oxide semi-conductor.
Claim 8
Dependent Claim
201 words
An ion detector output circuit, comprising; a. an ion detector means, b. gate means having its input connected to said ion detector means, c. a signal level detector means having its input connected to the output of said gate means, d. driven circuit means having its input connected to the output of said level detector means, e. indicator means having input connected to the output of said driven circuit means, f. triggered signal means having first and second outputs, said first output connected to the output of said gate means, g. first and second counter means each having first and second outputs and reset means, h. said first input connected to the second output of said trigger means and said second inputs connected to the input of said indicator means, said first input of said first counter means connected to the second input of said second counter means, said second output of said first counter means connected to the reset of said second counter means connected to said second output of said second counter means to the input of said indicator means, i. alarm means, and j. means connecting the first output of said second counter means to said alarm means.
Claim 9
Dependent Claim
201 words
An ion detector output circuit, comprising; a. an ion detector means, b. gate means having its input connected to said ion detector means, c. a signal level detector means having its input connected to the output of said gate means, d. driven circuit means having its input connected to the output of said level detector means, e. indicator means having input connected to the output of said driven circuit means, f. triggered signal means having first and second outputs, said first output connected to the output of said gate means, g. first and second counter means each having first and second outputs and reset means, h. said first input connected to the second output of said trigger means and said second inputs connected to the input of said indicator means, said first input of said first counter means connected to the second input of said second counter means, said second output of said first counter means connected to the reset of said second counter means connected to said second output of said second counter means to the input of said indicator means, i. alarm means, and j. means connecting the first output of said second counter means to said alarm means.
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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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |