US2508581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: United States, AS REPRESENTED BY OFFICE OF SCIENTIFIC RESEARCH AND DEVELOPMENT
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Filing: 1946-02-18
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Granted: 1950-05-23
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Expires: 1966-02-18
Abstract
No abstract record available.
Inventors
- 👤 Charles T Morrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:31
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/08; H04R1/083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US887124A
Cited
GB190826315A
Cited
US1004995A
Cited
US1376719A
Cited
US1381470A
Cited
US1399083A
Cited
US1678842A
Cited
FR816808A
Cited
GB549518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-22 | 1953-11-21 | 1954-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-22 | 1957-11-21 | 1958-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-22 | 1961-11-21 | 1962-05-23 | $7700.00 | Window Closed / Lapsed |