Patent US3424627A successfully refreshed from Google Patents.
US3424627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of fabricating a metal base transistor
Assignee: Telefunken Electronic GmbH
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Filing: 1965-12-10
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Granted: 1969-01-28
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Expires: 1985-12-10
Abstract
No abstract record available.
Inventors
- 👤 Hartmut Michel
- 👤 Gerd Seiter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:47
CPC Classifications
H; H10; H10W; H10W20/00; H10W20/40; H10D; H10D99/00; H10P; H10P95/00; H10W72/00; H10W72/071; H10W72/075; H10W72/07551; H10W72/07554; H10W72/50; H10W72/531; H10W72/536; H10W72/541; H10W72/547; Y; Y10; Y10S; Y10S148/00; Y10S148/051; Y10S148/106; Y10S148/142
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A METHOD FOR PRODUCING A TRANSISTOR COMPRISING THE STEPS OF: (A) PROVIDING A FIRST SEMICONDUCTOR BODY WHICH CONSTITUTES A FIRST REGION FOR SAID TRANSISTOR; (B) DEPOSITING A METAL LAYER WHICH CONSTITUTES A SECOND REGION FOR SAID TRANSISTOR AND DEPOSITING AN ETCHANT-RESISTANT METALLIC COATING IN CONTACT WITH ONE ANOTHER ON SAID FIRST BODY; (C) COVERING THE EXPOSED SURFACES OF SAID METAL LAYER AND SAID COATING WITH A SECOND SEMICONDUCTOR BODY WHICH CONSTITUTES A THIRD REGION FOR SAID TRANSISTOR; AND (D) ETCHING AWAY A PORTION OF AT LEAST SAID SECOND BODY FOR EXPOSING AN ELECTRODE CONTACTING SURFACE ON SAID METALLIC COATING.
Claim 2
Independent Claim
99 words
A METHOD FOR PRODUCING A TRANSISTOR COMPRISING THE STEPS OF: (A) PROVIDING A FIRST SEMICONDUCTOR BODY WHICH CONSTITUTES A FIRST REGION FOR SAID TRANSISTOR; (B) DEPOSITING A METAL LAYER WHICH CONSTITUTES A SECOND REGION FOR SAID TRANSISTOR AND DEPOSITING AN ETCHANT-RESISTANT METALLIC COATING IN CONTACT WITH ONE ANOTHER ON SAID FIRST BODY; (C) COVERING THE EXPOSED SURFACES OF SAID METAL LAYER AND SAID COATING WITH A SECOND SEMICONDUCTOR BODY WHICH CONSTITUTES A THIRD REGION FOR SAID TRANSISTOR; AND (D) ETCHING AWAY A PORTION OF AT LEAST SAID SECOND BODY FOR EXPOSING AN ELECTRODE CONTACTING SURFACE ON SAID METALLIC COATING.
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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) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |