Patent US3084078A successfully refreshed from Google Patents.
US3084078A
Expired / Lapsed
US
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High frequency germanium transistor
Assignee: Texas Instruments Inc
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Filing: 1959-12-02
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Granted: 1963-04-02
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Expires: 1979-12-02
Abstract
No abstract record available.
Inventors
- 👤 Robert E Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:22
CPC Classifications
H; H10; H10P; H10P95/00; C; C30; C30B; C30B15/00; C30B15/02; C30B15/04; C30B29/00; C30B29/02; C30B29/08; H10D; H10D99/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
THE METHOD OF PRODUCING A GROWN GERMANIUM CRYSTAL FOR MAKING IMPROVED GERMANIUM TRANSISTORS WHICH COMPRISES THE STEPS OF GROWING A LENGTH OF GERMANIUM CRYSTAL FROM A GERMANIUM MELT CONTAINING ACCEPTOR IMPURITIES, RETARDING THE GROWTH OF SAID CRYSTAL, ADDING TO SAID MELT AT LEAST TWO DONOR IMPURITIES HAVING DIFFERENT DIFFUSION RATES IN GERMANIUM, TOGETHER WITH AN ACCEPTOR IMPURITY HAVING A DIFFUSION RATE IN GERMANIUM SLOWER THAN EITHER OF SAID DONOR IMPURITIES, GROWING ANOTHER LENGTH OF CRYSTAL, AGAIN RETARDING GROWTH TO PERMIT DIFFUSION FROM SAID ANOTHER LENGTH INTO THE PREVIOUSLY-GROWN LENGTH, AND THEREAFTER GROWING AN ADDITIONAL LENGTH OF CRYSTAL.
Claim 2
Independent Claim
97 words
THE METHOD OF PRODUCING A GROWN GERMANIUM CRYSTAL FOR MAKING IMPROVED GERMANIUM TRANSISTORS WHICH COMPRISES THE STEPS OF GROWING A LENGTH OF GERMANIUM CRYSTAL FROM A GERMANIUM MELT CONTAINING ACCEPTOR IMPURITIES, RETARDING THE GROWTH OF SAID CRYSTAL, ADDING TO SAID MELT AT LEAST TWO DONOR IMPURITIES HAVING DIFFERENT DIFFUSION RATES IN GERMANIUM, TOGETHER WITH AN ACCEPTOR IMPURITY HAVING A DIFFUSION RATE IN GERMANIUM SLOWER THAN EITHER OF SAID DONOR IMPURITIES, GROWING ANOTHER LENGTH OF CRYSTAL, AGAIN RETARDING GROWTH TO PERMIT DIFFUSION FROM SAID ANOTHER LENGTH INTO THE PREVIOUSLY-GROWN LENGTH, AND THEREAFTER GROWING AN ADDITIONAL LENGTH OF CRYSTAL.
References Cited (Backward Citations)
US2730470A
Cited
US2790037A
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US2767358A
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GB779666A
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US2899343A
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US2822308A
Cited
US2843515A
Cited
FR1172813A
Cited
US2977256A
Cited
US2878152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-01 | 1966-10-01 | 1967-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-01 | 1970-10-01 | 1971-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-01 | 1974-10-01 | 1975-04-02 | $7700.00 | Window Closed / Lapsed |