Patent US3699360A successfully refreshed from Google Patents.
US3699360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
One-shot monostable multivibrator
Assignee: United States Department of the Army
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Filing: 1969-08-15
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Granted: 1972-10-17
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Expires: 1989-08-15
Abstract
Abstract Disclosed is a one-shot multivibrator of simplified and inexpensive construction which produces a constant width output pulse and which once triggered is not affected by additional trigger pulses until after the timing cycle is completed. A charged capacitor and resistor maintain a pair of transistors conducting and the transistors change state when current flow is diverted from them through a third transistor in response to a triggering signal. The multivibrator output is connected by a negative feedback lead to the third transistor. Also disclosed is a rate monitoring portion of an electrical heart monitor incorporating the multivibrator.
Inventors
- 👤 Charles W Ragsdale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:39
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/284
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
109 words
A monostable multivibrator comprising a pair of solid state switching devices, an output lead coupled to both said devices, means including an R-C timing circuit coupled to said devices for supplying current to said devices to maintain them conducting, a third solid state switching device coupled to said pair of devices and responsive to a trigger signal for diverting current from said pair of devices through said third device whereby said pair of devices switch to a nonconducting state, and feedback means coupling said output lead to said third device whereby said third device changes state in response to a change in state of said pair of switching devices.
Claim 2
Dependent Claim
109 words
A monostable multivibrator comprising a pair of solid state switching devices, an output lead coupled to both said devices, means including an R-C timing circuit coupled to said devices for supplying current to said devices to maintain them conducting, a third solid state switching device coupled to said pair of devices and responsive to a trigger signal for diverting current from said pair of devices through said third device whereby said pair of devices switch to a nonconducting state, and feedback means coupling said output lead to said third device whereby said third device changes state in response to a change in state of said pair of switching devices.
Claim 3
Dependent Claim
168 words
A monostable multivibrator comprising a pair of solid state switching devices, an output lead coupled to both said devices, means including an R-C timing circuit coupled to said devices for supplying current to said devices to maintain them conducting, means coupled to said devices and responsive to a trigger signal for diverting current from said devices whereby said devices switch to a nonconducting state, said current diverting means comprising a third solid state switching device, said switching devices all being transistors each having emitter, collector and base electrodes, the emitter-collector circuit of one of said pair of transistors being coupled to the base of the other of said pair of transistors, said other transistor having its emitter-collector circuit coupled to the base of said one transistor, said output lead being coupled to the base of said one transistor, and a feedback lead coupling said output lead to said third transistor whereby said third transistor changes state in response to a change In state of said pair of transistors.
Claim 4
Dependent Claim
168 words
A monostable multivibrator comprising a pair of solid state switching devices, an output lead coupled to both said devices, means including an R-C timing circuit coupled to said devices for supplying current to said devices to maintain them conducting, means coupled to said devices and responsive to a trigger signal for diverting current from said devices whereby said devices switch to a nonconducting state, said current diverting means comprising a third solid state switching device, said switching devices all being transistors each having emitter, collector and base electrodes, the emitter-collector circuit of one of said pair of transistors being coupled to the base of the other of said pair of transistors, said other transistor having its emitter-collector circuit coupled to the base of said one transistor, said output lead being coupled to the base of said one transistor, and a feedback lead coupling said output lead to said third transistor whereby said third transistor changes state in response to a change In state of said pair of transistors.
Claim 5
Dependent Claim
35 words
A multivibrator according to claim 2 wherein said feedback lead is coupled to the emitter-collector circuit of said third transistor, and means coupled to said third transistor for applying an input signal to its base.
Claim 6
Dependent Claim
16 words
A multivibrator according to claim 3 wherein said input means includes a differentiator and DC restorer.
Claim 7
Dependent Claim
27 words
A multivibrator according to claim 3 including a capacitor in parallel with said pair of transistors, said capacitor being fed through a resistor by a power supply.
Claim 8
Dependent Claim
89 words
A monostable multivibrator comprising a pair of solid state switching devices, an output lead coupled to both said devices, means including an R-C timing circuit coupled to said devices for supplying current to said devices to maintain them conducting, means coupled to said devices and responsive to a trigger signal for diverting current from said devices whereby said devices switch to a nonconducting state, and further comprising a pair of Schmitt triggers, and a digital filter coupling the output of said Schmitt triggers to the input of said multivibrator.
Claim 9
Dependent Claim
89 words
A monostable multivibrator comprising a pair of solid state switching devices, an output lead coupled to both said devices, means including an R-C timing circuit coupled to said devices for supplying current to said devices to maintain them conducting, means coupled to said devices and responsive to a trigger signal for diverting current from said devices whereby said devices switch to a nonconducting state, and further comprising a pair of Schmitt triggers, and a digital filter coupling the output of said Schmitt triggers to the input of said multivibrator.
Claim 10
Dependent Claim
14 words
Apparatus according to claim 6 wherein said digital filter comprises a pulse width discriminator.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |