US3307176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical protection system
Assignee: CSG Security Inc
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Filing: 1964-08-17
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Granted: 1967-02-28
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Expires: 1984-08-17
Abstract
No abstract record available.
Inventors
- 👤 Sadler John Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:05
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/01; G08B25/08; G08B13/00; G08B13/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
AN ELECTRICAL PROTECTION SYSTEM COMPRISING A PROTECTION CIRCUIT AT A PROTECTED AREA; A SUPERVISORY CIRCUIT AT A MONITORING STATION; A TRANSMISSION LINE CONNECTING THE PROTECTION CIRCUIT TO THE SUPERVIOSRY CIRCUIT; THE PROTECTION CIRCUIT INCLUDING A GENERATOR FOR TRANSMITTING TO THE SUPERVISORY CIRCUIT VIA THE TRANSMISSION LINE A FIRST SIGNAL COMPRISING DIRECT CURRENT PULSES TO INDICATE A NORMAL CONDITION OF THE SYSTEM, AND MEANS FOR REPLACING THE FIRST SIGNAL WITH A SECOND SIGNAL COMPRISING STEADY DIRECT CURRENT TO INDICATE AN ALARM CONDITION; AND THE SUPERVISORY CIRCUIT INCLUDING A FIRST DETECTOR FOR RECEIVING THE FIRST SIG-
Claim 2
Dependent Claim
94 words
AN ELECTRICAL PROTECTION SYSTEM COMPRISING A PROTECTION CIRCUIT AT A PROTECTED AREA; A SUPERVISORY CIRCUIT AT A MONITORING STATION; A TRANSMISSION LINE CONNECTING THE PROTECTION CIRCUIT TO THE SUPERVIOSRY CIRCUIT; THE PROTECTION CIRCUIT INCLUDING A GENERATOR FOR TRANSMITTING TO THE SUPERVISORY CIRCUIT VIA THE TRANSMISSION LINE A FIRST SIGNAL COMPRISING DIRECT CURRENT PULSES TO INDICATE A NORMAL CONDITION OF THE SYSTEM, AND MEANS FOR REPLACING THE FIRST SIGNAL WITH A SECOND SIGNAL COMPRISING STEADY DIRECT CURRENT TO INDICATE AN ALARM CONDITION; AND THE SUPERVISORY CIRCUIT INCLUDING A FIRST DETECTOR FOR RECEIVING THE FIRST SIG-
References Cited (Backward Citations)
GB803219A
Cited
US2869909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |