US2812446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photo-resistance device
Assignee: AT&T Inc
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Filing: 1954-03-05
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Granted: 1957-11-05
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Expires: 1974-03-05
Abstract
No abstract record available.
Inventors
- 👤 Gerald L Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:25
CPC Classifications
H; H10; H10F; H10F39/00; H10F39/10; H10F39/107; H10F99/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
145 words
IN COMBINATION, A SILICON BODY HAVING A GROSS PORTION OF N-TYPE CONDUCTIVITY AND HAVING A PLURALITY OF SURFACE ZONES OF A THICKNESS COMPARABLE TO THE DIFFUSION LENGTH OF ELECTRONS IN SAID ZONES, IN WHICH BORON IS THE PREDOMINAT IMPURITY WHEREBY SAID ZONES ARE OF P-TYPE CONUCTIVITY, AN ELECTRODE MAKING OHMIC CONNECTION TO THE N-TYPE GROSS PORTION OF THE BODY, A PLURALITY OF SEPARATE ELECTRODES EACH MAKING OHMIC CONNECTION TO A SEPARATE P-TYPE SURFACE ZONE, A VOLTAGE SOURCE HAVING ITS POSITIVE TERMINAL CONNECTED ELECTRICALLY TO THE ELECTRODE MAKING OHMIC CONNECTION TO THE N-TYPE GROSS PORTION OF BODY, AND MEANS FOR FORMING A PLURALITY OF BRANCH PATHS, EACH BRANCH PATH COMPRISING A SEPARATE LOAD AND A SEPARATE UNILATERALLY CONDUCTIVE ELEMENT AND BEING CONNECTED ELECTRICALLY BETWEEN THE NEGATIVE TERMINAL OF THE VOLTAGE SOURCE AND A SEPARATE ON OF THE ELECTRODES MAKING OHMIC CONECTION TO THE P-TYPE SURFACE ZONES.
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) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |