Patent US3343048A successfully refreshed from Google Patents.
US3343048A
Expired / Lapsed
US
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Four layer semiconductor switching devices having a shorted emitter and method of making the same
Assignee: Westinghouse Electric Corp
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Filing: 1964-02-20
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Granted: 1967-09-19
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Expires: 1984-02-20
Abstract
No abstract record available.
Inventors
- 👤 Richard T Kuehn
- 👤 Adalbert N Knopp
- 👤 Jr John J Steinmetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:52
CPC Classifications
H; H10; H10D; H10D62/00; H10D62/10; H10D62/13; H10D62/141; H10D62/148; H10D84/00; H10D84/60; H10D84/645; H10D99/00; H10P; H10P32/00; H10P52/00; H10P95/00; H10P95/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A SEMICONDUCTOR SWITICHING DEVICE COMPRISING: FIRST, SECOND, THIRD AND FOURTH SUCCESSIVE SEMICONDUCTIVE REGIONS OF ALTERNATE SEMICONDUCTIVITY TYPE WITH A P-N JUNCTION BETWEEN ADJACENT PAIR OF SAID REGIONS; SAID SECOND AND FOURTH REGIONS BEING OF DIFFUSED SEMICONDUCTIVE MATERIAL; SAID FIRST REGION BEING OF RECRYSTALLIZED SEMICONDUCTIVE MATERIAL WITH AN ALLOYED CONTACT THEREON; AN ELECTRICAL SHORT ACROSS AT LEAST A PORTION OF SID P-N JUNCTION BETWEEN SAID FIRST AND SECOND REGIONS COMPRISING A LAYER OF ETCH RESISTANT METAL ADHERENT TO SAID SECOND REGION AND TO SAID ALLOYED CONTACT ON SAID FIRST REGION, ETCH RESISTANT METAL BEING AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF GOLD, SILVER AND MEMBERS OF THE PLATINUM GROUP OF ELEMENTS; A MEMBER OF METAL SELECTED FROM THE GROUP CONSISTING OF MOLYBDENUM, TUNGSTEN AND BASE ALLOYS THEREOF JOINED TO SAID FOURTH REGION AND A LAYER OF SAID RESISTANT METAL ALSO DISPOSED ON THE SURFACE OF SAID MEMBER.
Claim 2
Dependent Claim
149 words
A SEMICONDUCTOR SWITICHING DEVICE COMPRISING: FIRST, SECOND, THIRD AND FOURTH SUCCESSIVE SEMICONDUCTIVE REGIONS OF ALTERNATE SEMICONDUCTIVITY TYPE WITH A P-N JUNCTION BETWEEN ADJACENT PAIR OF SAID REGIONS; SAID SECOND AND FOURTH REGIONS BEING OF DIFFUSED SEMICONDUCTIVE MATERIAL; SAID FIRST REGION BEING OF RECRYSTALLIZED SEMICONDUCTIVE MATERIAL WITH AN ALLOYED CONTACT THEREON; AN ELECTRICAL SHORT ACROSS AT LEAST A PORTION OF SID P-N JUNCTION BETWEEN SAID FIRST AND SECOND REGIONS COMPRISING A LAYER OF ETCH RESISTANT METAL ADHERENT TO SAID SECOND REGION AND TO SAID ALLOYED CONTACT ON SAID FIRST REGION, ETCH RESISTANT METAL BEING AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF GOLD, SILVER AND MEMBERS OF THE PLATINUM GROUP OF ELEMENTS; A MEMBER OF METAL SELECTED FROM THE GROUP CONSISTING OF MOLYBDENUM, TUNGSTEN AND BASE ALLOYS THEREOF JOINED TO SAID FOURTH REGION AND A LAYER OF SAID RESISTANT METAL ALSO DISPOSED ON THE SURFACE OF SAID MEMBER.
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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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |