US2846522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential amplifier circuits
Assignee: Sunoco Inc
•
Filing: 1953-02-18
•
Granted: 1958-08-05
•
Expires: 1973-02-18
Abstract
No abstract record available.
Inventors
- 👤 Brown Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:24
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/34; H03F3/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2475188A
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US2510714A
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GB620140A
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US2647214A
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US2497129A
Cited
US2494317A
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GB684862A
Cited
US2676300A
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US2676272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |