Patent US3340434A successfully refreshed from Google Patents.
US3340434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distance relay
Assignee: McGraw Edison Co
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Filing: 1965-01-21
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Granted: 1967-09-05
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Expires: 1985-01-21
Abstract
No abstract record available.
Inventors
- 👤 Richard E Riebs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:48
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/38; H02H3/382
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A DISTANCE RELAY FOR PROTECTING AN ALTERNATING CURRENT ELECTRIC SYSTEM, INPUT CIRCUIT MEANS COUPLED TO SAID SYSTEM FOR PRODUCING FIRST AND SECOND PAIRS OF ALTERNATING VOLTAGE AND CURRENT SIGNALS EACH HAVING PAIRS OF ALTERNATING FUNCTIONALLY RELATED TO THAT OF THE VOLTAGE AND CURRENT IN SAID SYSTEM, SAID INPUT CIRCUIT MEANS BEING CONSTRUCTED AND ARRANGED TO OFFSET THE VOLTAGE SIGNAL OF SAID SECOND PAIR OF SIGNALS RELATIVE TO THE VOLTAGE SIGNAL IN SAID FIRST PAIR OF SIGNALS AND TO PHASE MODIFY THE CURRENT SIGNAL OF SAID SECOND PAIR OF SIGNALS RELATIVE TO THE CURRENT SIGNAL OF SAID FIRST PAIR OF SIGNALS, PHASE SENSING CIRCUIT MEANS COUPLED TO SAID INPUT CIRCUIT MEANS FOR RECEIVING EACH OF SAID PAIRS OF ELECTRICAL SIGNALS AND BEING CONSTRUCTED AND ARRANGED TO PRODUCE AN OUTPUT SIGNAL WHEN SAID FIRST PAIR OF ELECTRICAL SIGNALS HAS A PREDETERMINED PHASE RELATION AND WHEN SAID SECOND PAIR OF MODIFIED ELECTRICAL SIGNALS HAS A PREDETERMINED PHASE RELATION, SAID INPUT CIRCUIT MEANS MODIFYING SAID SECOND PAIR OF ALTERNATING VOLTAGE AND CURRENT SIGNALS IN A MANNER TO PROVIDE SAID PHASE
Claim 2
Dependent Claim
176 words
A DISTANCE RELAY FOR PROTECTING AN ALTERNATING CURRENT ELECTRIC SYSTEM, INPUT CIRCUIT MEANS COUPLED TO SAID SYSTEM FOR PRODUCING FIRST AND SECOND PAIRS OF ALTERNATING VOLTAGE AND CURRENT SIGNALS EACH HAVING PAIRS OF ALTERNATING FUNCTIONALLY RELATED TO THAT OF THE VOLTAGE AND CURRENT IN SAID SYSTEM, SAID INPUT CIRCUIT MEANS BEING CONSTRUCTED AND ARRANGED TO OFFSET THE VOLTAGE SIGNAL OF SAID SECOND PAIR OF SIGNALS RELATIVE TO THE VOLTAGE SIGNAL IN SAID FIRST PAIR OF SIGNALS AND TO PHASE MODIFY THE CURRENT SIGNAL OF SAID SECOND PAIR OF SIGNALS RELATIVE TO THE CURRENT SIGNAL OF SAID FIRST PAIR OF SIGNALS, PHASE SENSING CIRCUIT MEANS COUPLED TO SAID INPUT CIRCUIT MEANS FOR RECEIVING EACH OF SAID PAIRS OF ELECTRICAL SIGNALS AND BEING CONSTRUCTED AND ARRANGED TO PRODUCE AN OUTPUT SIGNAL WHEN SAID FIRST PAIR OF ELECTRICAL SIGNALS HAS A PREDETERMINED PHASE RELATION AND WHEN SAID SECOND PAIR OF MODIFIED ELECTRICAL SIGNALS HAS A PREDETERMINED PHASE RELATION, SAID INPUT CIRCUIT MEANS MODIFYING SAID SECOND PAIR OF ALTERNATING VOLTAGE AND CURRENT SIGNALS IN A MANNER TO PROVIDE SAID PHASE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-04 | 1971-03-06 | 1971-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-04 | 1975-03-06 | 1975-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-04 | 1979-03-06 | 1979-09-05 | $7700.00 | Window Closed / Lapsed |