US3500143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency power transistor having different resistivity base regions
Assignee: US Philips Corp
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Filing: 1967-07-21
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Granted: 1970-03-10
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Expires: 1987-07-21
Abstract
No abstract record available.
Inventors
- 👤 Jack Stewart Lamming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:44
CPC Classifications
H; H10; H10W; H10W15/00; H10D; H10D10/00; H10D10/01; H10D10/051; H10D10/056; H10D10/058; H10D99/00; H10W15/01
Claims Analysis
Total Claims: 0
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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) | 1973-03-09 | 1973-09-08 | 1974-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-09 | 1977-09-08 | 1978-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-09 | 1981-09-08 | 1982-03-10 | $7700.00 | Window Closed / Lapsed |