US2638550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable frequency oscillator
Assignee: Faximile Inc
•
Filing: 1946-08-10
•
Granted: 1953-05-12
•
Expires: 1966-08-10
Abstract
No abstract record available.
Inventors
- 👤 Frank A Hester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:16
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/04; H03K3/05; H03K3/06; H03K3/08; H03C; H03C3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2331317A
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US2338395A
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US2321269A
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US2378245A
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US2444084A
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US2434669A
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US2447816A
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US2422424A
Cited
US2426996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |