US3794775A
Expired / Lapsed
US
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Digital impulse corrector for telecommunication circuitry
Assignee: AEI TELECOMM Ltd
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Filing: 1971-07-29
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Granted: 1974-02-26
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Expires: 1991-07-29
Abstract
Abstract An add-on circuit automatically adjusts or maintains the make and break ratios of telecommunication dial pulsing within limits, thus helping to eliminate many network and trunk line signalling problems.
Inventors
- 👤 P Hicks
- 👤 M Gale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:05
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/32; H04Q1/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
98 words
A digital impulse corrector comprising digital integrated circuit logic control means, including first and second adjustable timers, for comparing the duration of a pulse in an input pulse train with the preset period of said first adjustable timer and for controlling a discrete transistor means so as to produce an output pulse having a duration substantially equal to or greater than a preset period of said second adjustable timer when the duration of the input pulse is equal to or greater than the preset period of the first adjustable timer, each of said timers comprising a monostable circuit.
Claim 2
Dependent Claim
98 words
A digital impulse corrector comprising digital integrated circuit logic control means, including first and second adjustable timers, for comparing the duration of a pulse in an input pulse train with the preset period of said first adjustable timer and for controlling a discrete transistor means so as to produce an output pulse having a duration substantially equal to or greater than a preset period of said second adjustable timer when the duration of the input pulse is equal to or greater than the preset period of the first adjustable timer, each of said timers comprising a monostable circuit.
Claim 3
Dependent Claim
69 words
A digital impulse corrector according to claim 1 wherein, when the duration of the input pulse is equal to or greater than the sum of the two said preset periods, the duration of the output pulse is equal to the duration of the preset period of the second adjustable timer plus the amount by which the duration of the input pulse exceeds the sum of the two preset periods.
Claim 4
Dependent Claim
23 words
A digital impulse corrector according to claim 1 wherein the period of each said adjustable timer is set by means of a potentiometer.
Claim 5
Dependent Claim
32 words
A digital impulse corrector according to claim 3 further comprising a relay connected to the output of said logic control means and operable by the said output pulse to produce corrector output.
Claim 6
Dependent Claim
58 words
A digital impulse corrector according to claim 1 further comprising a delay means for receiving said input pulse train, a trigger circuit connected to the output of said delay means and connected to the input of said logic control means and a buffer relay connected to the output of said logic control means for producing corrected output pulses.
References Cited (Backward Citations)
US3312784A
Cited
US3450843A
Cited
US3452220A
Cited
US3504290A
Cited
US3544724A
Cited
US3700821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |