US3539825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly linear voltage to frequency converter
Assignee: Collins Radio Co
•
Filing: 1967-01-24
•
Granted: 1970-11-10
•
Expires: 1987-01-24
Abstract
No abstract record available.
Inventors
- 👤 Fred W Hardaway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:38
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/50; H03K4/501; H03K4/502; H03K4/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2748278A
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US2748272A
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US2861239A
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US2997602A
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US3018385A
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US3188455A
Cited
US3129326A
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US3138767A
Cited
US3278737A
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US3349251A
Cited
US3435257A
Cited
US3422372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |