US3218525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four region switching transistor for relatively large currents
Assignee: Westinghouse Electric Corp
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Filing: 1961-03-30
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Granted: 1965-11-16
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Expires: 1981-03-30
Abstract
No abstract record available.
Inventors
- 👤 David L Moore
- 👤 Suzuki Toshihiko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:02
CPC Classifications
H; H10; H10D; H10D18/00; H10D1/00; H10D1/60; H10D1/62; H10D62/00; H10D62/10; H10D62/60; H10D84/00; H10D84/60; H10D84/645; H10D84/67; H10D99/00; H10P; H10P32/00; H10P95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A SEMICONDUCTOR SWITCH COMPISING A MONOCRYSTALLINE SEMICONDUCTOR MEMBER HAVING FOUR CONSECUTIVE REGIONS OF ALTERNATE P-TYHPE AND N-TYPE CONDUCTIVITY MATERIAL TO FORM A FIRST OUTER REGION, A FIRST INNER REGION, A SECOND INNER REGION AND A SECOND OUTER REGION HAVING RECTIFYING FUNCTIONS THEREBETWEEN, SAID FIRST INNER REGION HAVING A FIRST PORTION EXTENDING ACROSS A FIRST MAJOR SURFACE OF SAID SECOND INNER REGION AND A SECOND PORTION EXTENDING AROUND THE EDGE OF SAID SECOND INNER REGION, AND COMPRISING A PERIPHERAL PORTION ON A SECOND MAJOR SURFACE OF SAID SECOND INNER REGION, SIAD PERIPHERAL PORTION BEING COPLANAR WITH SAID SECOND OUTER REGION A CLOSED LOOP GROOVE SEPARATING SAID SECOND OUTER REGION AND SAID PERIPHERAL PORTION OF SAID FIRST INNER REGION, A FIRST TERMINAL MEANS HAVING AN ELECTRICAL CONTACT WITH SAID FIRST OUTER REGION, SECOND TERMINAL MEANS HAVING AN ELECTRICAL CONTACT WITH SAID SECOND OUTER REGION, AND THIRD TERMINAL MEANS HAVING ELECTRICAL CONTACT WITH SAID PERIPHERAL PORTION OF SAID FIRST INNER REGION.
Claim 2
Dependent Claim
158 words
A SEMICONDUCTOR SWITCH COMPISING A MONOCRYSTALLINE SEMICONDUCTOR MEMBER HAVING FOUR CONSECUTIVE REGIONS OF ALTERNATE P-TYHPE AND N-TYPE CONDUCTIVITY MATERIAL TO FORM A FIRST OUTER REGION, A FIRST INNER REGION, A SECOND INNER REGION AND A SECOND OUTER REGION HAVING RECTIFYING FUNCTIONS THEREBETWEEN, SAID FIRST INNER REGION HAVING A FIRST PORTION EXTENDING ACROSS A FIRST MAJOR SURFACE OF SAID SECOND INNER REGION AND A SECOND PORTION EXTENDING AROUND THE EDGE OF SAID SECOND INNER REGION, AND COMPRISING A PERIPHERAL PORTION ON A SECOND MAJOR SURFACE OF SAID SECOND INNER REGION, SIAD PERIPHERAL PORTION BEING COPLANAR WITH SAID SECOND OUTER REGION A CLOSED LOOP GROOVE SEPARATING SAID SECOND OUTER REGION AND SAID PERIPHERAL PORTION OF SAID FIRST INNER REGION, A FIRST TERMINAL MEANS HAVING AN ELECTRICAL CONTACT WITH SAID FIRST OUTER REGION, SECOND TERMINAL MEANS HAVING AN ELECTRICAL CONTACT WITH SAID SECOND OUTER REGION, AND THIRD TERMINAL MEANS HAVING ELECTRICAL CONTACT WITH SAID PERIPHERAL PORTION OF SAID FIRST INNER REGION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |