US3131376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security-line-surveillance system
Assignee: Electrada Corp
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Filing: 1961-03-01
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Granted: 1964-04-28
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Expires: 1981-03-01
Abstract
No abstract record available.
Inventors
- 👤 Vall Wilbur E Du
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:05
CPC Classifications
G; G08; G08B; G08B29/00; G08B29/02; G08B29/06; G08B29/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
A SECURITY-LINE-SUPERVISORY SYSTEM COMPRISING AT A CENTRAL LOCATION MEANS FOR RANDOMLY GENERATING PULSES, MEANS FOR ESTABLISHING A TRANSMITTING INTERVAL HAVING A RANDOM DURATION RESPONSIVE TO SAID RANDOMLY GENERATED PULSES, MEANS FOR COUNTING THE RANDOM PULSES OCCURRING DURING A TRANSMITTING INTERVAL AND ESTABLISHING A REPRESENTATIVE VOLTAGE PATTERN, A LINE CONNECTING SAID CENTRAL LOCATION TO A REMOTE LOCATION, MEANS FOR TRANSMITTING THE RANDOM PULSES GENERATED DURING A TRANSMITTING INTERVAL TO SAID REMOTE LOCATION OVER SAID LINE, MEANS AT SAID REMOTE LOCATION FOR RECEIVING SAID TRANSMITTED PULSES, MEANS FOR COUNTING THE RECEIVED PULSES AND ESTABLISHING A REPRESENTATIVE VOLTAGE PATTERN, MEANS FOR TRANSMITTING SIGNALS REPRESENTATIVE OF SAID VOLTAGE PATTERN OVER SAID LINE TO SAID CENTRAL LOCATION, AT SAID CENTRAL LOCATION, MEANS FOR RECEIVING SAID SIGNALS AND CONVERTING THEM TO THE VOLTAGE PATTERN REPRESENTED THEREBY, MEANS FOR COMPARING BOTH RECEIVED AND RETAINED VOLTAGE PATTERNS, AND MEANS FOR INDICATING WHEN A DIFFERENCE BETWEEN SAID COMPARED VOLTAGE PULSE PATTERNS EXISTS.
Claim 2
Dependent Claim
153 words
A SECURITY-LINE-SUPERVISORY SYSTEM COMPRISING AT A CENTRAL LOCATION MEANS FOR RANDOMLY GENERATING PULSES, MEANS FOR ESTABLISHING A TRANSMITTING INTERVAL HAVING A RANDOM DURATION RESPONSIVE TO SAID RANDOMLY GENERATED PULSES, MEANS FOR COUNTING THE RANDOM PULSES OCCURRING DURING A TRANSMITTING INTERVAL AND ESTABLISHING A REPRESENTATIVE VOLTAGE PATTERN, A LINE CONNECTING SAID CENTRAL LOCATION TO A REMOTE LOCATION, MEANS FOR TRANSMITTING THE RANDOM PULSES GENERATED DURING A TRANSMITTING INTERVAL TO SAID REMOTE LOCATION OVER SAID LINE, MEANS AT SAID REMOTE LOCATION FOR RECEIVING SAID TRANSMITTED PULSES, MEANS FOR COUNTING THE RECEIVED PULSES AND ESTABLISHING A REPRESENTATIVE VOLTAGE PATTERN, MEANS FOR TRANSMITTING SIGNALS REPRESENTATIVE OF SAID VOLTAGE PATTERN OVER SAID LINE TO SAID CENTRAL LOCATION, AT SAID CENTRAL LOCATION, MEANS FOR RECEIVING SAID SIGNALS AND CONVERTING THEM TO THE VOLTAGE PATTERN REPRESENTED THEREBY, MEANS FOR COMPARING BOTH RECEIVED AND RETAINED VOLTAGE PATTERNS, AND MEANS FOR INDICATING WHEN A DIFFERENCE BETWEEN SAID COMPARED VOLTAGE PULSE PATTERNS EXISTS.
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) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |