Patent US2501986A successfully refreshed from Google Patents.
US2501986A
Expired / Lapsed
US
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Single channel two-way communication system
Assignee: SPX Technologies Inc
•
Filing: 1945-06-07
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Granted: 1950-03-28
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Expires: 1965-06-07
Abstract
No abstract record available.
Inventors
- 👤 Brockman Lyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:11
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2199179A
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US2206231A
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US2433281A
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US2366011A
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US2426581A
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US2435010A
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US2408878A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |