Patent US2845374A successfully refreshed from Google Patents.
US2845374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor unit and method of making same
Assignee: Texas Instruments Inc
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Filing: 1955-05-23
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Granted: 1958-07-29
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Expires: 1975-05-23
Abstract
No abstract record available.
Inventors
- 👤 Morton E Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:13
CPC Classifications
H; H10; H10P; H10P95/00; H10P95/50; H10D; H10D99/00; H10P32/00; H10P32/10; H10P32/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A TRANSISTOR DEVICE COMPRISING A BLOCK OF SEMICONDUCTOR MATERIAL WITH A MELTING POINT GREATER THAN 1400*C. AND CONTAINING AN IMPURITY PRODUCING THEREIN A CONDUCTIVITY OF ONE TYPE, AND A MATERIAL PRODUCING AN OPPOSITE TYPE CONDUCTIVITY ALLOYED AND DIFFUSED INTO AT LEAST ONE SURFACE OF SAID SEMICONDUCTOR BLOCK AT A TEMPERATURE OF FROM 1000*C. TO 1400*C. OVER A PERIOD OF FROM 10 TO 50 HOURS WHEREBY A GRADED P-N JUNCTION IS PRODUCED, SAID MATERIAL BEING DIFFUSED TO A DEPTH SUCH THAT A NARROW REGION OF SAID ONE TYPE CONDUCTIVITY IS PROVIDED IN THE PATH OF CURRENT FLOW BETWEEN INPUT AND OUTPUT CONNECTIONS TO SAID BLOCK
Claim 2
Dependent Claim
104 words
A TRANSISTOR DEVICE COMPRISING A BLOCK OF SEMICONDUCTOR MATERIAL WITH A MELTING POINT GREATER THAN 1400*C. AND CONTAINING AN IMPURITY PRODUCING THEREIN A CONDUCTIVITY OF ONE TYPE, AND A MATERIAL PRODUCING AN OPPOSITE TYPE CONDUCTIVITY ALLOYED AND DIFFUSED INTO AT LEAST ONE SURFACE OF SAID SEMICONDUCTOR BLOCK AT A TEMPERATURE OF FROM 1000*C. TO 1400*C. OVER A PERIOD OF FROM 10 TO 50 HOURS WHEREBY A GRADED P-N JUNCTION IS PRODUCED, SAID MATERIAL BEING DIFFUSED TO A DEPTH SUCH THAT A NARROW REGION OF SAID ONE TYPE CONDUCTIVITY IS PROVIDED IN THE PATH OF CURRENT FLOW BETWEEN INPUT AND OUTPUT CONNECTIONS TO SAID BLOCK
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) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |