US2838617A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit-arrangement comprising a four-zone transistor
Assignee: US Philips Corp
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Filing: 1953-12-22
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Granted: 1958-06-10
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Expires: 1973-12-22
Abstract
No abstract record available.
Inventors
- 👤 Tummers Leonard Johan
- 👤 Stieltjes Frederik Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:37
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/04; H03F3/14; H10; H10D; H10D88/00; H10D99/00
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) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |