Patent US2579140A successfully refreshed from Google Patents.
US2579140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wave projector
Assignee: Individual
•
Filing: 1946-03-13
•
Granted: 1951-12-18
•
Expires: 1966-03-13
Abstract
No abstract record available.
Inventors
- 👤 Crawford Walter Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:19
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US908838A
Cited
FR481152A
Cited
US1300202A
Cited
US1478564A
Cited
US1445306A
Cited
US1462036A
Cited
US1721425A
Cited
US1858702A
Cited
US1913517A
Cited
US1981328A
Cited
US2118419A
Cited
US1931980A
Cited
GB410336A
Cited
DE678010C
Cited
US2059033A
Cited
FR770482A
Cited
US2078302A
Cited
US2018829A
Cited
US2198014A
Cited
US2191379A
Cited
US2283935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |