US3215568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor devices
Assignee: AT&T Inc
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Filing: 1961-08-04
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Granted: 1965-11-02
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Expires: 1981-08-04
Abstract
No abstract record available.
Inventors
- 👤 William G Pfann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:48
CPC Classifications
H; H04; H04R; H04R23/00; H04R23/006; H10; H10D; H10D99/00; H10P; H10P95/00; Y; Y10; Y10S; Y10S438/00; Y10S438/938
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
AN IMPROVED TRANSISTOR COMPRISING AN N-P-N GERMANIUM TRANSISTOR IN WHICH THE DIRECTION OF ELECTRON FLOW FROM THE EMITTER TO THE COLLECTOR THROUGH THE P-TYPE BASE LAYER IS APPROXIMATLY PERPENDICULAR TO THE (111) CRYSTAL DIRECTION OF THE BASE LAYER AND THE DIRECTION OF HOLD CARRIERS THROUGH THE BASE LAYER FROM BASE TO EMITTER IS APPROXIMATELY PARALLEL TO THE (111) CRYSTAL DIRECTION OF THE BASE LAYER AND MEANS ASSOCIATED WITH SAID TRANSISTOR FOR APPLYING A PERMANENT ELASTIC COMPRESSIVE STRESS TO THE P-TYPE BASE LAYER BELOW ITS ELASTIC LLIMIT APPROXIMATELY IN THE (111) CRYSTAL DIRECTION SAID STRESS BEING SUFFICIENT TO INCREASE THE CARRIER MOBILITY IN THE BASE LAYER BY AT LEAST 10%.
Claim 2
Dependent Claim
109 words
AN IMPROVED TRANSISTOR COMPRISING AN N-P-N GERMANIUM TRANSISTOR IN WHICH THE DIRECTION OF ELECTRON FLOW FROM THE EMITTER TO THE COLLECTOR THROUGH THE P-TYPE BASE LAYER IS APPROXIMATLY PERPENDICULAR TO THE (111) CRYSTAL DIRECTION OF THE BASE LAYER AND THE DIRECTION OF HOLD CARRIERS THROUGH THE BASE LAYER FROM BASE TO EMITTER IS APPROXIMATELY PARALLEL TO THE (111) CRYSTAL DIRECTION OF THE BASE LAYER AND MEANS ASSOCIATED WITH SAID TRANSISTOR FOR APPLYING A PERMANENT ELASTIC COMPRESSIVE STRESS TO THE P-TYPE BASE LAYER BELOW ITS ELASTIC LLIMIT APPROXIMATELY IN THE (111) CRYSTAL DIRECTION SAID STRESS BEING SUFFICIENT TO INCREASE THE CARRIER MOBILITY IN THE BASE LAYER BY AT LEAST 10%.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |