US2749499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Symmetrical frequency doubler
Assignee: Individual
•
Filing: 1951-06-14
•
Granted: 1956-06-05
•
Expires: 1971-06-14
Abstract
No abstract record available.
Inventors
- 👤 Harold E Hosticka
- 👤 Lewis R Beckett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:31
CPC Classifications
H; H03; H03B; H03B19/00; H03B19/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US736884A
Cited
US1394325A
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US1505234A
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US2085515A
Cited
US2461861A
Cited
US2440465A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |