US3410965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
D. c. signalling system
Assignee: NEC Corp
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Filing: 1965-06-16
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Granted: 1968-11-12
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Expires: 1985-06-16
Abstract
No abstract record available.
Inventors
- 👤 Sudo Taro
- 👤 Kitamura Akihiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:21
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A TWO-WAY D.C. SIGNALLING ARRANGEMENT IN COMBINATION WITH A WIRE PAIR OF COMPRISING AT EACH OF THE LOCAL AND DISTANT SIGNALLING POINTS: A D.C. SOURCE HAVING ONE TERMINAL COUPLED TO GROUND; MEANS SWITCHABLE BETWEEN THE OTHER TERMINAL OF SAID SOURCE AND GROUND; A RELAY HAVING THREE WINDINGS, THE FIRSW WINDING BEING COUPLED AT ONE END THEREOF TO SAID MEANS AND AT THE OTHER END TO A FIRST ONE OF SAID WIRE PAIR, THE SECOND WINDING BEING COUPLED AT ONE END THEREOF TO SAID MEANS AND AT THE OTHER END TO GROUND, EACH OF SAID FIRST AND SECOND WINDINGS BEING OPPOSITE IN FLUX POLARITY TO EACH OTHER, AND THE THIRD WINDING BEING COUPLED AT ONE END THEREOF TO GROUND AND AT THE OTHER END TO THE SECOND ONE OF SAID WIRE PAIR AND BEING OPPOSITE IN FLUX POLARITY TO SAID FIRST WINDING.
Claim 2
Dependent Claim
141 words
A TWO-WAY D.C. SIGNALLING ARRANGEMENT IN COMBINATION WITH A WIRE PAIR OF COMPRISING AT EACH OF THE LOCAL AND DISTANT SIGNALLING POINTS: A D.C. SOURCE HAVING ONE TERMINAL COUPLED TO GROUND; MEANS SWITCHABLE BETWEEN THE OTHER TERMINAL OF SAID SOURCE AND GROUND; A RELAY HAVING THREE WINDINGS, THE FIRSW WINDING BEING COUPLED AT ONE END THEREOF TO SAID MEANS AND AT THE OTHER END TO A FIRST ONE OF SAID WIRE PAIR, THE SECOND WINDING BEING COUPLED AT ONE END THEREOF TO SAID MEANS AND AT THE OTHER END TO GROUND, EACH OF SAID FIRST AND SECOND WINDINGS BEING OPPOSITE IN FLUX POLARITY TO EACH OTHER, AND THE THIRD WINDING BEING COUPLED AT ONE END THEREOF TO GROUND AND AT THE OTHER END TO THE SECOND ONE OF SAID WIRE PAIR AND BEING OPPOSITE IN FLUX POLARITY TO SAID FIRST WINDING.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-12 | 1972-05-13 | 1972-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-12 | 1976-05-13 | 1976-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-12 | 1980-05-13 | 1980-11-12 | $7700.00 | Window Closed / Lapsed |