US2510681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio apparatus
Assignee: National Co Inc
•
Filing: 1946-06-21
•
Granted: 1950-06-06
•
Expires: 1966-06-21
Abstract
No abstract record available.
Inventors
- 👤 Dudley H Campbell
- 👤 William J Larkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:02
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/08; H04B1/086
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US321078A
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US2028717A
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US2171553A
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US2110433A
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US2203946A
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US2290521A
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US2372672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-05 | 1953-12-05 | 1954-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-05 | 1957-12-05 | 1958-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-05 | 1961-12-05 | 1962-06-06 | $7700.00 | Window Closed / Lapsed |