Patent US3223902A successfully refreshed from Google Patents.
US3223902A
Expired / Lapsed
US
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Power transistor and method of manufacture
Assignee: RCA Corp
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Filing: 1963-03-19
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Granted: 1965-12-14
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Expires: 1983-03-19
Abstract
No abstract record available.
Inventors
- 👤 Jerome E Wright
- 👤 Shellick Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:31
CPC Classifications
H; H10; H10W; H10W72/00; H10W72/30; H10W72/20; H10W76/00; H10W76/10; H10W76/12; H10W76/13; H10W76/132; H10W72/071; H10W72/073; H10W72/07331; H10W72/07336
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A SEMICONDUCTOR DEVICE COMPRISING A THERMALLY AND ELECTRICALLY CONDUCTIVE BASE, A LAYER OF INDIUM ON ONE FACE OF SAID BASE, A NICKEL PLATE COATED ON ONE MAJOR FACE WITH INDIUM AND BONDED BY AID INDIUM COATING TO SAID IDIUM LAYER ON SAID BASE, A LEAD-CONTAINING ELECTRODE BONDED ON ONE SIDE TO THE OPPOSITE FACEOF SAID NICKEL PLATE, AND A SEMICONDUCTOR WAFER ALLOYED TO THE OPPOSITE SIDE OF SAID ELECTRODE.
Claim 2
Dependent Claim
69 words
A SEMICONDUCTOR DEVICE COMPRISING A THERMALLY AND ELECTRICALLY CONDUCTIVE BASE, A LAYER OF INDIUM ON ONE FACE OF SAID BASE, A NICKEL PLATE COATED ON ONE MAJOR FACE WITH INDIUM AND BONDED BY AID INDIUM COATING TO SAID IDIUM LAYER ON SAID BASE, A LEAD-CONTAINING ELECTRODE BONDED ON ONE SIDE TO THE OPPOSITE FACEOF SAID NICKEL PLATE, AND A SEMICONDUCTOR WAFER ALLOYED TO THE OPPOSITE SIDE OF SAID ELECTRODE.
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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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |