US3239392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of silicon controlled rectifiers
Assignee: Associated Electrical Industries Ltd
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Filing: 1963-08-12
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Granted: 1966-03-08
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Expires: 1983-08-12
Abstract
No abstract record available.
Inventors
- 👤 Sadler Albert John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:33
CPC Classifications
H; H10; H10W; H10W20/00; H10W20/40; H10D; H10D99/00; H10W72/00; H10W72/50; H10W72/531; H10W72/536
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
IN THE MANUFACTURE OF A SILICON CONTROLLED RECTIFIER COMPRISING A BODY OF SILICON HAVING FOUR REGIONS THEREIN, TWO OF N-TYPE CONDUCTIVITY AND TWO OF P-TYPE CONDUCTIVITY ARRANGED ALTERNATELY TO PROVIDE THREE P-N JUNCTIONS BETWEEN THEM, THE FORMATION OF A CONTACT LAYER TO WHICH AN ELECTRODE MAY BE ATTACHED, SAID LAYER ALSO FORMING A SHORT-CIRCUIT BETWEEN THE REGION WHICH IS TO SERVE AS THE EMITTER AND THE REGION ADJACENT THERETO, BY HEATING THE SILICON TO A TEMPERATURE BETWEEN 400* AND 650*C., AT WHICH GOLD FORMS A EUTECTIC THEREWITH, DEPOSITING GOLD IN FINELY DIVIDED FORM ONTO A SURFACE OF THE BODY SO AS TO FORM A MOLTEN LAYER THEREON WHICH OVERLAPS PART OF THE JUNCTION BETWEEN SAID EMITTER REGION AND THE REGION ADJACENT THERETO, AND QUICKL SOLIDIFYING THE MOLTEN LAYER BEFORE IMPURITY MATERIAL PRESENT IN THE REGION WHICH IS TO SERVE AS THE EMITTER ENTERS INTO SAID LAYER.
Claim 2
Dependent Claim
146 words
IN THE MANUFACTURE OF A SILICON CONTROLLED RECTIFIER COMPRISING A BODY OF SILICON HAVING FOUR REGIONS THEREIN, TWO OF N-TYPE CONDUCTIVITY AND TWO OF P-TYPE CONDUCTIVITY ARRANGED ALTERNATELY TO PROVIDE THREE P-N JUNCTIONS BETWEEN THEM, THE FORMATION OF A CONTACT LAYER TO WHICH AN ELECTRODE MAY BE ATTACHED, SAID LAYER ALSO FORMING A SHORT-CIRCUIT BETWEEN THE REGION WHICH IS TO SERVE AS THE EMITTER AND THE REGION ADJACENT THERETO, BY HEATING THE SILICON TO A TEMPERATURE BETWEEN 400* AND 650*C., AT WHICH GOLD FORMS A EUTECTIC THEREWITH, DEPOSITING GOLD IN FINELY DIVIDED FORM ONTO A SURFACE OF THE BODY SO AS TO FORM A MOLTEN LAYER THEREON WHICH OVERLAPS PART OF THE JUNCTION BETWEEN SAID EMITTER REGION AND THE REGION ADJACENT THERETO, AND QUICKL SOLIDIFYING THE MOLTEN LAYER BEFORE IMPURITY MATERIAL PRESENT IN THE REGION WHICH IS TO SERVE AS THE EMITTER ENTERS INTO SAID LAYER.
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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |