US3342651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing thyristors by diffusion in semiconductor material
Assignee: Siemens Schuckertwerke AG
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Filing: 1965-03-16
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Granted: 1967-09-19
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Expires: 1985-03-16
Abstract
No abstract record available.
Inventors
- 👤 Raithel Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:02
CPC Classifications
H; H10; H10D; H10D10/00; H10D18/00; H10D62/00; H10D62/10; H10D62/17; H10D99/00; H10P; H10P32/00; H10P50/00; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/062
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
THE METHOD OF PRODUCING A PNPN-THYRISTOR HAVING A MONOCRYSTALLINE SILICON WAFER WITH FOUR REGIONS OF ALTERNATELY OPPOSED CONDUCTANCE TYPE FORMING THREE P-N JUCNTIONS WITH EACH OTHER, WHICH COMPRISES COVERING ONE FLAT SIDE OF THE WAFER WITH A GOLD COATING OF 0.1 TO 0.5 MICRON THICKNESS, HEATING THE COATED WAFER TO A DIFFUSION TEMPERATURE OF APPROXITMATELY 820*C. UNTIL THE GOLD HAS DIFFUSED INTO THE WAFER DOWN TO THE DEPTH OF THE INTERMEDIATE ONE OF SAID P-N JUNCTION, AND THEN ABRUPTLY COOLING THE WAFER AT A RATE OF MORE THAN 50*C. PR MINUTE.
Claim 2
Independent Claim
91 words
THE METHOD OF PRODUCING A PNPN-THYRISTOR HAVING A MONOCRYSTALLINE SILICON WAFER WITH FOUR REGIONS OF ALTERNATELY OPPOSED CONDUCTANCE TYPE FORMING THREE P-N JUCNTIONS WITH EACH OTHER, WHICH COMPRISES COVERING ONE FLAT SIDE OF THE WAFER WITH A GOLD COATING OF 0.1 TO 0.5 MICRON THICKNESS, HEATING THE COATED WAFER TO A DIFFUSION TEMPERATURE OF APPROXITMATELY 820*C. UNTIL THE GOLD HAS DIFFUSED INTO THE WAFER DOWN TO THE DEPTH OF THE INTERMEDIATE ONE OF SAID P-N JUNCTION, AND THEN ABRUPTLY COOLING THE WAFER AT A RATE OF MORE THAN 50*C. PR MINUTE.
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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |