Patent US3603955A successfully refreshed from Google Patents.
US3603955A
Expired / Lapsed
US
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Minute volume alarm equipment
Assignee: DONTI RESEARCH DEV Manufacturing
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Filing: 1969-03-05
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Granted: 1971-09-07
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Expires: 1989-03-05
Abstract
Abstract Minute volume alarm equipment for monitoring the flow of gas and producing an alarm when the gas volume falls without a prescribed range is disclosed. The equipment includes a high input impedance monitor amplifier which senses analog electrical signals in a minute volume indicator. These signals are amplified by a differential amplifier and then coupled through a low output impedance buffer amplifier to low and high limit detectors. When the minute volume falls without the range defined by these limits an alarm amplifier is operated to activate an alarm device.
Inventors
- 👤 Donald Levy
- 👤 Tibor Rusz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:45
CPC Classifications
G; G01; G01P; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P1/103; G01P13/00; G01P13/0006; G01P13/004; G01P13/0046; G08; G08B; G08B21/00; G08B21/18; G08B21/182
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
289 words
In equipment for measuring fluid flow parameters and for use in combination with a minute volume indicator having therein electrical signals which are the analog of the minute volume of fluid flow, means for monitoring said fluid parameters comprising a high input impedance monitor amplifier including a field effect transistor differential amplifier for sensing and translating the analog signals and means including a pair of cascaded differential amplifiers for amplifying the signals translated by said monitoring amplifier, means responsive to the deviations of said monitored fluid parameters from a prescribed range of values for automatically supplying an alarm condition and comprising low and high limit detectors concurrently responsive to said translated signals and an alarm amplifier for activating an alarm device, the output of said detectors being coupled to the input of said alarm amplifier, said low limit detector being responsive to deviations below the lower limit of said range to activate said alarm amplifier and said alarm device, and said high limit detector being responsive to deviations above the upper limit of said range to activate said alarm amplifier and said alarm device, a buffer amplifier comprising a Darlington-pair transistor amplifier interposed between said amplifier means and said detectors for providing a low output impedance to the input of said detectors, said low limit detector comprises a differential amplifier having one of its inputs controllably fixed at a voltage corresponding to the lower limit of said range and its other input connected to the output of said Darlington amplifier, and said high limit detecTor comprising a differential amplifier having one of its inputs controllably fixed at a voltage corresponding to the upper limit of said range and its other input connected to the output of said Darlington amplifier.
Claim 2
Dependent Claim
289 words
In equipment for measuring fluid flow parameters and for use in combination with a minute volume indicator having therein electrical signals which are the analog of the minute volume of fluid flow, means for monitoring said fluid parameters comprising a high input impedance monitor amplifier including a field effect transistor differential amplifier for sensing and translating the analog signals and means including a pair of cascaded differential amplifiers for amplifying the signals translated by said monitoring amplifier, means responsive to the deviations of said monitored fluid parameters from a prescribed range of values for automatically supplying an alarm condition and comprising low and high limit detectors concurrently responsive to said translated signals and an alarm amplifier for activating an alarm device, the output of said detectors being coupled to the input of said alarm amplifier, said low limit detector being responsive to deviations below the lower limit of said range to activate said alarm amplifier and said alarm device, and said high limit detector being responsive to deviations above the upper limit of said range to activate said alarm amplifier and said alarm device, a buffer amplifier comprising a Darlington-pair transistor amplifier interposed between said amplifier means and said detectors for providing a low output impedance to the input of said detectors, said low limit detector comprises a differential amplifier having one of its inputs controllably fixed at a voltage corresponding to the lower limit of said range and its other input connected to the output of said Darlington amplifier, and said high limit detecTor comprising a differential amplifier having one of its inputs controllably fixed at a voltage corresponding to the upper limit of said range and its other input connected to the output of said Darlington amplifier.
Claim 3
Dependent Claim
92 words
The invention of claim 1 wherein said alarm amplifier comprises a transistor having emitter, base and collector regions, impedance means in the collector circuit of said transistor, an alarm device connected in parallel with said impedance means, means for reverse biasing said emitter-base regions in the quiescent state of said amplifier, diode means separately coupling the outputs of said low and high limit detectors to said base region, said emitter-base region being forward biased when either of said detectors detects a deviation outside of said range, thereby to activate said alarm device.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |