US2890353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor switching circuit
Assignee: US Philips Corp
•
Filing: 1954-10-20
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Granted: 1959-06-09
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Expires: 1974-10-20
Abstract
No abstract record available.
Inventors
- 👤 Adrianus Johannes Wilhel Marie
- 👤 Johannes Theodorus Anto Lottum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:47
CPC Classifications
H; H04; H04Q; H04Q3/00; G; G05; G05B; G05B11/00; G05B11/01; G05B11/012; H01; H01J; H01J19/00; H01J19/28; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/64; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/286; H03K3/35; H03K4/00; H03K4/06; H03K4/08; H03K4/83; H03K4/84; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0013
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2605306A
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US2569345A
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US2666150A
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US2594449A
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US2663806A
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US2655609A
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US2663800A
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US2751550A
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US2698416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |