Patent US2996580A successfully refreshed from Google Patents.
US2996580A
Expired / Lapsed
US
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Closed-circuit communications signal distribution system
Assignee: AR&T Electronics Inc
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Filing: 1958-01-30
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Granted: 1961-08-15
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Expires: 1978-01-30
Abstract
No abstract record available.
Inventors
- 👤 Reid John Drysdale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:34
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/3827; H04H; H04H60/00; H04H60/29; H04H60/32; H04H20/00; H04H20/53; H04H20/61; H04H20/63; H04H60/33
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |