US2821493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fused junction transistors with regrown base regions
Assignee: Raytheon Co
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Filing: 1954-03-18
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Granted: 1958-01-28
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Expires: 1974-03-18
Abstract
No abstract record available.
Inventors
- 👤 Jr Justice N Carman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:38
CPC Classifications
H; H10; H10P; H10P10/00; C; C30; C30B; C30B31/00; C30B31/04; H10D; H10D99/00; H10P95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
THE METHOD OF PRODUCING A FUSED JUNCTION N-P-N TRANSISTOR WHICH COMPRISES THE STEPS OF: FUSING A FIRST ALLOY PELLET, INCLUDING AN ACCEPTOR IMPURITY, TO AN N-TYPE MONATOMIC SEMICONDUCTOR SPECIMEN TO CONVERT A REGION OF THE SPECIMEN TO A REGROWN P-TYPE BASE REGION HAVING AN ALLOY BUTTON PRODUCING THEREFROM; DISSOLVING THE ALLOY BUTTON OFF SAID BASE REGION TO EXPOSE THE SURFACE OF SAID BASE REGION; ETCHING THE SURFACE OF SAID BASE REGION; AND FUSING A SECOND ALLOY PELLET, INCLUDING A DONOR IMPURITY, TO SAID BASE REGION TO RECONVERT A PORTION OF SAID BASE REGION TO AN N-TYPE REGION.
Claim 2
Independent Claim
97 words
THE METHOD OF PRODUCING A FUSED JUNCTION N-P-N TRANSISTOR WHICH COMPRISES THE STEPS OF: FUSING A FIRST ALLOY PELLET, INCLUDING AN ACCEPTOR IMPURITY, TO AN N-TYPE MONATOMIC SEMICONDUCTOR SPECIMEN TO CONVERT A REGION OF THE SPECIMEN TO A REGROWN P-TYPE BASE REGION HAVING AN ALLOY BUTTON PRODUCING THEREFROM; DISSOLVING THE ALLOY BUTTON OFF SAID BASE REGION TO EXPOSE THE SURFACE OF SAID BASE REGION; ETCHING THE SURFACE OF SAID BASE REGION; AND FUSING A SECOND ALLOY PELLET, INCLUDING A DONOR IMPURITY, TO SAID BASE REGION TO RECONVERT A PORTION OF SAID BASE REGION TO AN N-TYPE REGION.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |