Patent US1894687A successfully refreshed from Google Patents.
US3168649A
Expired / Lapsed
US
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Shift register employing bistable multiregion semiconductive devices
Assignee: AT&T Inc
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Filing: 1960-08-05
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Granted: 1965-02-02
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Expires: 1980-08-05
Abstract
No abstract record available.
Inventors
- 👤 Stanley T Meyers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:32
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/28; H; H03; H03K; H03K23/00; H03K23/40; H03K23/50; H03K23/54; H03K3/00; H03K3/02; H03K3/335
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A SHIFT REGISTER COMPRISING, IN COMBINATION, A PLURALITY OF REGISTERS EACH COMPRISING, A THREE TERMINAL BISTABLE MULTIREGION DEVICE HAVING AN EMITTER ELECTRODE, A COLLECTOR ELECTRODE, A BASE ELECTRODE, A PREDETERMINED COLLECTOR-EMITTER BREAKDOWN VOLTAGE, AND MEANS TO SUPPLY A COLLECTOR-EMITTER VOLTAGE IN EXCESS OF SAID BREAKDOWN VOLTAGE, A SOURCE OF TWO STATE INPUT SIGNALS COMPRISING PULSES AND SPACES TO BE REGISTERED, DIRECT CURRENT COUPLED SWITCHING MEANS TO INJECT A FORWARD BIASING CURRENT INTO THE BASE OF A FIRST OF SAID MULTIREGION SEMICONDUCTOR DEVICES IN RESPONSE TO A FIRST STATE OF SAID INPUT SIGNAL, WHEREBY SAID FIRST DEVICE SWITCHES INTO ITS HIGH COLLECTOREMITTER CURRENT STATE AND REMAINS THERE EVEN AFTER REMOVAL OF SAID FORWARD BIASING CURRENT, FEEDBACK MEANS TO INJECT A REVERSE BIASING CURRENT INTO THE BASE OF SAID FIRST DEVICE IN RESPONSE TO A SECOND STATE OF SAID INPUT SIGNAL, WHEREBY
Claim 2
Dependent Claim
140 words
A SHIFT REGISTER COMPRISING, IN COMBINATION, A PLURALITY OF REGISTERS EACH COMPRISING, A THREE TERMINAL BISTABLE MULTIREGION DEVICE HAVING AN EMITTER ELECTRODE, A COLLECTOR ELECTRODE, A BASE ELECTRODE, A PREDETERMINED COLLECTOR-EMITTER BREAKDOWN VOLTAGE, AND MEANS TO SUPPLY A COLLECTOR-EMITTER VOLTAGE IN EXCESS OF SAID BREAKDOWN VOLTAGE, A SOURCE OF TWO STATE INPUT SIGNALS COMPRISING PULSES AND SPACES TO BE REGISTERED, DIRECT CURRENT COUPLED SWITCHING MEANS TO INJECT A FORWARD BIASING CURRENT INTO THE BASE OF A FIRST OF SAID MULTIREGION SEMICONDUCTOR DEVICES IN RESPONSE TO A FIRST STATE OF SAID INPUT SIGNAL, WHEREBY SAID FIRST DEVICE SWITCHES INTO ITS HIGH COLLECTOREMITTER CURRENT STATE AND REMAINS THERE EVEN AFTER REMOVAL OF SAID FORWARD BIASING CURRENT, FEEDBACK MEANS TO INJECT A REVERSE BIASING CURRENT INTO THE BASE OF SAID FIRST DEVICE IN RESPONSE TO A SECOND STATE OF SAID INPUT SIGNAL, WHEREBY
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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) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |