US3526815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controllable semi-conductor devices comprising main and auxiliary thyristors having all except one emitter-layer in common
Assignee: ABB Norden Holding AB
•
Filing: 1967-07-07
•
Granted: 1970-09-01
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Expires: 1987-07-07
Abstract
No abstract record available.
Inventors
- 👤 Per Svedberg
- 👤 Bengt-Arne Vedin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:10
CPC Classifications
H; H10; H10D; H10D84/00; H10D84/60; H10D84/676; H10D18/00; H10D18/221
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3201596A
Cited
US3124703A
Cited
US3210620A
Cited
US3160800A
Cited
US3123750A
Cited
US3274460A
Cited
US3408545A
Cited
US3409811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-31 | 1974-03-02 | 1974-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-31 | 1978-03-02 | 1978-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-31 | 1982-03-02 | 1982-09-01 | $7700.00 | Window Closed / Lapsed |