US3287239A
Expired / Lapsed
US
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Method for making a semiconductor device
Assignee: Telefunken Patentverwertungs GmbH
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Filing: 1963-04-16
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Granted: 1966-11-22
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Expires: 1983-04-16
Abstract
No abstract record available.
Inventors
- 👤 Froschle Ernst
- 👤 Steppat Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:50
CPC Classifications
H; H10; H10P; H10P50/00; H10P50/69; H10P50/691; H10P50/692; C; C25; C25F; C25F3/00; C25F3/02; C25F3/12; H10D; H10D99/00; H10P50/60; H10P50/61; H10P50/613
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
IN A METHOD OF MAKING A MESA ETCHED ASYMMETRICAL SEMICONDUCTOR DEVIDE OF THE TYPE WHEREIN THE SEMICONDUCTOR BODY HAS THE CONDUCTIVITY TYPE OF THE COLLECTOR ZONE, WHICH COLLECTOR ZONE HAS A COLLECTOR ELECTRODE CONNECTED DIRECTLY THERETO, AND HAS A BASE ZONE DISPOSED BETWEEN SAID COLLECTOR ZONE ANS AN EMITTER ZONE, THE IMPROVEMENT COMPRISING ELECTROLYTICALLY ETCHING SAID DEVICE BY APPLYING AN ETCHING POTENTIAL TO SAID COLLECTOR ELEC-
Claim 2
Dependent Claim
66 words
IN A METHOD OF MAKING A MESA ETCHED ASYMMETRICAL SEMICONDUCTOR DEVIDE OF THE TYPE WHEREIN THE SEMICONDUCTOR BODY HAS THE CONDUCTIVITY TYPE OF THE COLLECTOR ZONE, WHICH COLLECTOR ZONE HAS A COLLECTOR ELECTRODE CONNECTED DIRECTLY THERETO, AND HAS A BASE ZONE DISPOSED BETWEEN SAID COLLECTOR ZONE ANS AN EMITTER ZONE, THE IMPROVEMENT COMPRISING ELECTROLYTICALLY ETCHING SAID DEVICE BY APPLYING AN ETCHING POTENTIAL TO SAID COLLECTOR ELEC-
References Cited (Backward Citations)
US2757323A
Cited
US3072514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |