Patent US3321631A successfully refreshed from Google Patents.
US3321631A
Expired / Lapsed
US
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Electro-optical switch device
Assignee: Texas Instruments Inc
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Filing: 1963-11-29
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Granted: 1967-05-23
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Expires: 1983-11-29
Abstract
No abstract record available.
Inventors
- 👤 James R Biard
- 👤 Edward L Bonin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:58
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/14; G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/575; H03F; H03F3/00; H03F3/04; H03F3/08; H03F3/085; H03F3/34; H03F3/343; H03K17/00; H03K17/51; H03K17/78; H03K17/795; H03K17/7955; H10; H10D; H10D99/00; H10F; H10F55/00; H10F55/20; H10F55/25; Y; Y10; Y10S; Y10S323/00; Y10S323/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
AN ELECTRO-OPTICAL COUPLING SYSTEM, COMPRISING: (A) A FIRST SEMICONDUCTOR DEVICE HAVING A FIRST REGION OF A FIRST CONDUCTIVITY TYPE AND A SECOND REGION OF AN OPPOSITE CONDUCTIVITY TYPE CONTINGUOUS TO AND FORMING A RECTIFYING JUNCTION WITH SAID FIRST REGION, (B) SAID FIRST DEVICE BEING CHARACTERIZED BY THE GENERATION OF OPTICAL RADIATION WHEN A FORWARD CURRENT IS CAUSED TO FLOW THROUGH SAID RECTIFYING JUNCTION, (C) A TRANSISTOR, AND (D) PHOTOSENSITIVE MEANS CONNECTED IN ELECTRICAL PARALLEL WITH THE EMITTER-BASE JUNCTION OF SAID TRANSISTOR AND OPTICALLY COUPLED TO SAID FIRST DEVICE FOR GENERATING A FORWARD BIAS CURRENT THROUGH SAID EMITTER-BASE JUNCTION IN RESPONSE TO SAID OPTICAL RADIATION.
Claim 2
Dependent Claim
104 words
AN ELECTRO-OPTICAL COUPLING SYSTEM, COMPRISING: (A) A FIRST SEMICONDUCTOR DEVICE HAVING A FIRST REGION OF A FIRST CONDUCTIVITY TYPE AND A SECOND REGION OF AN OPPOSITE CONDUCTIVITY TYPE CONTINGUOUS TO AND FORMING A RECTIFYING JUNCTION WITH SAID FIRST REGION, (B) SAID FIRST DEVICE BEING CHARACTERIZED BY THE GENERATION OF OPTICAL RADIATION WHEN A FORWARD CURRENT IS CAUSED TO FLOW THROUGH SAID RECTIFYING JUNCTION, (C) A TRANSISTOR, AND (D) PHOTOSENSITIVE MEANS CONNECTED IN ELECTRICAL PARALLEL WITH THE EMITTER-BASE JUNCTION OF SAID TRANSISTOR AND OPTICALLY COUPLED TO SAID FIRST DEVICE FOR GENERATING A FORWARD BIAS CURRENT THROUGH SAID EMITTER-BASE JUNCTION IN RESPONSE TO SAID OPTICAL RADIATION.
References Cited (Backward Citations)
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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) | 1970-05-22 | 1970-11-21 | 1971-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-22 | 1974-11-21 | 1975-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-22 | 1978-11-21 | 1979-05-23 | $7700.00 | Window Closed / Lapsed |