Patent US3449669A successfully refreshed from Google Patents.
US3449669A
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US
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Frequency control circuit transforming phase angle into frequency
Assignee: Linde Sverige AB
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Filing: 1966-02-07
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Granted: 1969-06-10
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Expires: 1986-02-07
Abstract
No abstract record available.
Inventors
- 👤 Carl-Erik Granqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:09
CPC Classifications
H; H03; H03L; H03L7/00; H03C; H03C3/00; H03C3/02; H03C3/08; H03C3/10; H03C3/28; H04; H04N; H04N5/00; H04N5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3005960A
Cited
US3229203A
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US3160803A
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US3263066A
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US3199037A
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US3177442A
Cited
US3267357A
Cited
US3329900A
Cited
US3325750A
Cited
US3334305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |