Patent US3331923A successfully refreshed from Google Patents.
US3331923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telegraph leg disconnect device
Assignee: Pioneer Electric and Research Corp
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Filing: 1963-10-24
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Granted: 1967-07-18
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Expires: 1983-10-24
Abstract
No abstract record available.
Inventors
- 👤 James T Neiswinter
- 👤 Carl N Pederson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:20
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/20; H04L25/207
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
231 words
A TELETYPE CONTROL CIRCUIT FOR INSERTION BETWEEN A RECEIVE LEG OF A TELETYPE LEG AND A RECEIVE HUB COMPRISING: SWITCH CONTACTS FOR DISCONNECTING A RECEIVE LEG FROM A RECEIVE HUB; A RECTIFIER; A PAIR OF TERMINALS OF WHICH ONE IS ADAPTED TO BE CONNECTED TO A RECEIVE LEG AND THE OTHER IS ADAPTED TO BE CONNECTED TO A RECEIVE HUB; SAID SWITCH CONTACTS AND SAID RECTIFIER BEING CONNECTED IN SERIES BETWEEN SAID TERMINALS; A FIRST TRANSISTOR HAVING A COLLECTOR, AN EMITTER AND A BASE, SAID COLLECTOR AND EMITTER BEING ADAPTED TO BE CONNECTED ACROSS A DIRECT CURRENT SOURCE, SAID BASE BEING CONNECTED TO ONE SIDE OF SAID RECTIFIER AND TO SAID RECEIVE HUB TERMINAL; A SECOND TRANSISTOR HAVING A COLLECTOR, AN EMITTER AND A BASE, SAID COLLECTOR AND EMITTER BEING ADAPTED TO BE CONNECTED ACROSS A DIRECT CURRENT SOURCE, SAID BASE BEING CONNECTED TO THE FIRST TRANSISTOR EMITTER; A THIRD TRANSISTOR HAVING A COLLECTOR, AN EMITTER AND A BASE, SAID COLLECTOR AND EMITTER BEING ADAPTED TO BE CONNECTED ACROSS A SOURCE OF DIRECT CURRENT VOLTAGE, SAID BASE BEING CONNECTED TO SAID SECOND TRANSISTOR COLLECTOR; A RELAY COIL CONTROLLING SAID SWITCH CONTACTS; A FOURTH TRANSISTOR HAVING A COLLECTOR, AN EMITTER AND A BASE, SAID COLLECTOR AND EMITTER BEING ADAPTED TO BE CONNECTED IN SERIES WITH SAID RELAY COIL ACROSS A DIRECT CURRENT SOURCE, SAID BASE BEING CONNECTED TO THE THIRD TRANSISTOR EMITTER;
Claim 2
Dependent Claim
231 words
A TELETYPE CONTROL CIRCUIT FOR INSERTION BETWEEN A RECEIVE LEG OF A TELETYPE LEG AND A RECEIVE HUB COMPRISING: SWITCH CONTACTS FOR DISCONNECTING A RECEIVE LEG FROM A RECEIVE HUB; A RECTIFIER; A PAIR OF TERMINALS OF WHICH ONE IS ADAPTED TO BE CONNECTED TO A RECEIVE LEG AND THE OTHER IS ADAPTED TO BE CONNECTED TO A RECEIVE HUB; SAID SWITCH CONTACTS AND SAID RECTIFIER BEING CONNECTED IN SERIES BETWEEN SAID TERMINALS; A FIRST TRANSISTOR HAVING A COLLECTOR, AN EMITTER AND A BASE, SAID COLLECTOR AND EMITTER BEING ADAPTED TO BE CONNECTED ACROSS A DIRECT CURRENT SOURCE, SAID BASE BEING CONNECTED TO ONE SIDE OF SAID RECTIFIER AND TO SAID RECEIVE HUB TERMINAL; A SECOND TRANSISTOR HAVING A COLLECTOR, AN EMITTER AND A BASE, SAID COLLECTOR AND EMITTER BEING ADAPTED TO BE CONNECTED ACROSS A DIRECT CURRENT SOURCE, SAID BASE BEING CONNECTED TO THE FIRST TRANSISTOR EMITTER; A THIRD TRANSISTOR HAVING A COLLECTOR, AN EMITTER AND A BASE, SAID COLLECTOR AND EMITTER BEING ADAPTED TO BE CONNECTED ACROSS A SOURCE OF DIRECT CURRENT VOLTAGE, SAID BASE BEING CONNECTED TO SAID SECOND TRANSISTOR COLLECTOR; A RELAY COIL CONTROLLING SAID SWITCH CONTACTS; A FOURTH TRANSISTOR HAVING A COLLECTOR, AN EMITTER AND A BASE, SAID COLLECTOR AND EMITTER BEING ADAPTED TO BE CONNECTED IN SERIES WITH SAID RELAY COIL ACROSS A DIRECT CURRENT SOURCE, SAID BASE BEING CONNECTED TO THE THIRD TRANSISTOR EMITTER;
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) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |