US2854568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diversity reception arrangements for radio waves
Assignee: International Standard Electric Corp
•
Filing: 1954-04-14
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Granted: 1958-09-30
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Expires: 1974-04-14
Abstract
No abstract record available.
Inventors
- 👤 Lewin Leonard
- 👤 Walker Thomas Harold
- 👤 Pethick Albert Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:10
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/10; H03; H03J; H03J7/00; H03J7/18; H03J7/30; H04B7/04; H04B7/08; H04B7/0837; H04B7/084; H04B7/0842; H04B7/0865; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2375223A
Cited
US2448866A
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US2505266A
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US2629816A
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US2678385A
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US2786133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |