Patent US2652381A successfully refreshed from Google Patents.
Patent US3268781A successfully refreshed from Google Patents.
US3268781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
P-nu junction transistor with increased resistance in current path across base surface
Assignee: US Philips Corp
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Filing: 1962-08-23
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Granted: 1966-08-23
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Expires: 1982-08-23
Abstract
No abstract record available.
Inventors
- 👤 Le Claude Jan Principe Freder Can
- 👤 Petrus Albertus Maria Hospel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:50
CPC Classifications
H; H10; H10P; H10P50/00; H10P50/60; H10P50/61; H10P50/613; H10D; H10D99/00; H10P14/00; H10P14/40; H10P14/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A JUNCTION TRANSISTOR COMPRISING A SEMICONDUCTIVE BODY WITH EMITTER AND COLLECTOR ZONES OF ONE TYPE CONDUCTIVITY, A BASE ZONE OF THE OPPOSITE CONDUCTIVITY TYPE SANDWICHED BETWEEN THEM AND EXTENDING TO THE SURFACE OF THE SEMICONDUCTIVE BODY, THE BASE ZONE HAVING A SURFACE PORTION WITH A THICKNESS DIMENSION, SEPARATING THE ADJACENT EMITTER AND COLLECTOR ZONES, THAT IS OF APPROXIMATELY THE SAME THICKNESS AS THAT OF THE INTERIOR BASE ZONE PORTIONS, A PORTION OF THE BASE ZONE AT THE SURFACE HAVING A REGION WHICH IS THINNER THAN THE ADJACENT INTERIOR PORTION OF THE BASE ZONE AND FORMING A CURRENT PATH BETWEEN THE EMITTER AND COLLECTOR ZONES, ALONG THE SURFACE OF THE BASE ZONE, THAT IS SUBSTANTIALLY LONGER THAN THE SPACING BETWEEN THEM, AND SAID THINNER REGION OF THE BASE ZONE BEING CONTIGUOUS WITH ONE OF THE EMITTER AND COLLECTOR ZONES.
Claim 2
Dependent Claim
138 words
A JUNCTION TRANSISTOR COMPRISING A SEMICONDUCTIVE BODY WITH EMITTER AND COLLECTOR ZONES OF ONE TYPE CONDUCTIVITY, A BASE ZONE OF THE OPPOSITE CONDUCTIVITY TYPE SANDWICHED BETWEEN THEM AND EXTENDING TO THE SURFACE OF THE SEMICONDUCTIVE BODY, THE BASE ZONE HAVING A SURFACE PORTION WITH A THICKNESS DIMENSION, SEPARATING THE ADJACENT EMITTER AND COLLECTOR ZONES, THAT IS OF APPROXIMATELY THE SAME THICKNESS AS THAT OF THE INTERIOR BASE ZONE PORTIONS, A PORTION OF THE BASE ZONE AT THE SURFACE HAVING A REGION WHICH IS THINNER THAN THE ADJACENT INTERIOR PORTION OF THE BASE ZONE AND FORMING A CURRENT PATH BETWEEN THE EMITTER AND COLLECTOR ZONES, ALONG THE SURFACE OF THE BASE ZONE, THAT IS SUBSTANTIALLY LONGER THAN THE SPACING BETWEEN THEM, AND SAID THINNER REGION OF THE BASE ZONE BEING CONTIGUOUS WITH ONE OF THE EMITTER AND COLLECTOR ZONES.
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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |