Patent US3614735A successfully refreshed from Google Patents.
US3614735A
Expired / Lapsed
US
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Monitoring circuits
Assignee: Plessey Overseas Ltd
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Filing: 1969-10-16
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Granted: 1971-10-19
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Expires: 1989-10-16
Abstract
Abstract The preferred circuit uses NAND gates or NOR gates in integrated circuit form and is employed for monitoring the ''''set'''' and ''''reset'''' sides of six storage toggles A to F to determine the validity or otherwise of their coded outputs. The circuit comprises three branches appropriate to the terms: (A B) (C D) (E F) ..... 1/6, 3/6, 5/6 (C+D) (AB+EF) ..... 3 of 4/6 (A+B) (CD+EF) These branches are arranged to ensure that the only valid conditions are 2-out-of-6 and the null condition 0-out-of-6.
Inventors
- 👤 Roy Harold Mauger
- 👤 John Michael Frampton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:56
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/08; G06F11/085
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
234 words
A monitoring circuit operative according to the collective state of six storage toggles or the like each capable of assuming a first condition and a second condition and arranged in first, second and third mutually exclusive pairs, comprising first, second and third Exclusive-OR devices each having an output lead and each controlled by said first, second and third pairs of toggles, respectively, to produce a particular signal at its respective output lead only when either of the related toggles is in the first condition; fourth and fifth Exclusive-OR devices each having two input leads and an output lead, said fourth device being controlled by outputs of said first and second Exclusive-OR devices, said fifth device being controlled from the outputs of said third and fourth devices, said fifth device being arranged to produce a signal of one form at its output lead if an odd number of storage toggles are in said first condition and to produce a signal of the alternative form for all other combinations of conditions of the toggles; and first and second circuit means having individual output leads separately controlled by all the toggles for producing a signal corresponding to said alternative form at both of said first and second circuit means output leads only in response to those of said other combinations of conditions wherein solely two of said toggles or none of them are in said first condition.
Claim 2
Dependent Claim
234 words
A monitoring circuit operative according to the collective state of six storage toggles or the like each capable of assuming a first condition and a second condition and arranged in first, second and third mutually exclusive pairs, comprising first, second and third Exclusive-OR devices each having an output lead and each controlled by said first, second and third pairs of toggles, respectively, to produce a particular signal at its respective output lead only when either of the related toggles is in the first condition; fourth and fifth Exclusive-OR devices each having two input leads and an output lead, said fourth device being controlled by outputs of said first and second Exclusive-OR devices, said fifth device being controlled from the outputs of said third and fourth devices, said fifth device being arranged to produce a signal of one form at its output lead if an odd number of storage toggles are in said first condition and to produce a signal of the alternative form for all other combinations of conditions of the toggles; and first and second circuit means having individual output leads separately controlled by all the toggles for producing a signal corresponding to said alternative form at both of said first and second circuit means output leads only in response to those of said other combinations of conditions wherein solely two of said toggles or none of them are in said first condition.
Claim 3
Dependent Claim
83 words
A monitoring circuit as recited in claim 1, including output gating means connected to the output leads of said fifth Exclusive-OR device and said first and second circuit means for generating a significant signal when a signal corresponding to said alternative form is received by said outout gating means from each of said fifth Exclusive-OR device and said first and second circuit means, whereby said significant signal indicates that any two of said toggles or none of them are in said first condition.
Claim 4
Dependent Claim
26 words
A monitoring circuit as recited in claim 2, wherein said Exclusive-OR devices and said first and second circuit means are comprised exclusively of 2-input NAND gates.
Claim 5
Dependent Claim
26 words
A monitoring circuit as recited in claim 2, wherein said Exclusive-OR devices and said first and second circuit means are comprised exclusively of 2-input NOR gates.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |