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Patent US3254235A successfully refreshed from Google Patents.
US3254235A
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Signal monitoring instrument
Assignee: Singer Co
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Filing: 1963-07-15
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Granted: 1966-05-31
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Expires: 1983-07-15
Abstract
No abstract record available.
Inventors
- 👤 Albert J Schiro
- 👤 John E Mcbrian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:34
CPC Classifications
G; G08; G08B; G08B23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A MONITOR CIRCUIT RESPONSIVE TO VARIATIONS OF A SIGNAL FROM A DIRECT-CURRENT SIGNAL LEVEL INCLUDING, (A) MEANS FOR COUPLING ONLY VARIATIONS FROM THE NORMAL DIRECT-CURRENT LEVEL OF A SIGNAL FROM A SOURCE, A TRANSISTOR CIRCUIT HAVING A FIRST INPUT CIRCUIT, A SECOND INPUT CIRCUIT AND A BISTABLE OUTPUT CIRCUIT, SAID MEANS FOR COUPLING INCLUDING RECTIFIER, SAID RECTIFIER CONVERTING VARIATIONS SUPPLIED THERETO UNDIRECTIONAL VARIATIONS, SAID MEANS FOR COUPLING BEING CONNECTED TO SAID FIRST INPUT CIRCUIT FOR SUPPLYING UNIDIRECTIONAL VARIATIONS TO SAID FIRST IPUT CIRCUIT OF SAID TRANSISTOR CIRCUIT, (B) SAID BISTABLE OUTPUT CIRCUIT OF SAID TRANSISTOR CIRCUIT HAVING NORMAL AND ABNORMAL CONDITIONS OF OPERATIONS, TRANSFER FROM SAID NORMAL CONDITION TO SAID ABNORMAL CONDITION OBTAINABLE IN RESPONSE TO RECEPTION OF SAID UNIDIRECTIONAL VARIATIONS BY SAID FIRST INPUT CIRCUIT,
Claim 2
Dependent Claim
126 words
A MONITOR CIRCUIT RESPONSIVE TO VARIATIONS OF A SIGNAL FROM A DIRECT-CURRENT SIGNAL LEVEL INCLUDING, (A) MEANS FOR COUPLING ONLY VARIATIONS FROM THE NORMAL DIRECT-CURRENT LEVEL OF A SIGNAL FROM A SOURCE, A TRANSISTOR CIRCUIT HAVING A FIRST INPUT CIRCUIT, A SECOND INPUT CIRCUIT AND A BISTABLE OUTPUT CIRCUIT, SAID MEANS FOR COUPLING INCLUDING RECTIFIER, SAID RECTIFIER CONVERTING VARIATIONS SUPPLIED THERETO UNDIRECTIONAL VARIATIONS, SAID MEANS FOR COUPLING BEING CONNECTED TO SAID FIRST INPUT CIRCUIT FOR SUPPLYING UNIDIRECTIONAL VARIATIONS TO SAID FIRST IPUT CIRCUIT OF SAID TRANSISTOR CIRCUIT, (B) SAID BISTABLE OUTPUT CIRCUIT OF SAID TRANSISTOR CIRCUIT HAVING NORMAL AND ABNORMAL CONDITIONS OF OPERATIONS, TRANSFER FROM SAID NORMAL CONDITION TO SAID ABNORMAL CONDITION OBTAINABLE IN RESPONSE TO RECEPTION OF SAID UNIDIRECTIONAL VARIATIONS BY SAID FIRST INPUT CIRCUIT,
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) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |