Patent US3821780A successfully refreshed from Google Patents.
US3821780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double mesa transistor with integral bleeder resistors
Assignee: Motors Liquidation Co
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Filing: 1972-10-24
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Granted: 1974-06-28
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Expires: 1992-10-24
Abstract
Abstract A HIGH VOLTAGE AND HIGH CURRENT MESA TYPE INTEGRATED CIRCUIT OF CASCADED COMMON COLLECTOR MESA EMITTER TRANSISTORS AND BLEEDER RESISTORS THAT RESIST SECONDARY BREAKDOWN. AN INTEGRATED DARLINGTON AMPLIDIER CIRCUIT IS PROVIDED HAVING AN INPUT EMITTER MESA WHICH IS AN ANNULUS SURROUNDING AN INPUT TRANSISTOR BASE REGION. AN OUTPUT TRANSISTOR BASE REGION SURROUNDS BOTH THE INPUT EMITTER MEANS AND AN OUTPUT EMITTER MESA. IN A PREFERRED EMBODIMENT A THIRD MESA IS PROVIDED WITHIN THE INPUT TRANSISTOR BASE REGION, TO FACILITATE WIRE BONDING TO THAT REGION.
Inventors
- 👤 G Harland
- 👤 R Metzger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:45
CPC Classifications
H; H10; H10D; H10D84/00; H10D84/60; H10D84/611; H10D84/613; H10D84/615; H10D84/641; H10D84/642
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |