Patent US2855540A successfully refreshed from Google Patents.
US2855540A
Expired / Lapsed
US
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Beam positioning system
Assignee: AT&T Inc
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Filing: 1956-04-27
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Granted: 1958-10-07
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Expires: 1976-04-27
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles W Hoover
- 👤 Raymond W Ketchledge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:52
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/02; H04B14/04; H04B14/044; G; G11; G11C; G11C11/00; G11C11/21; G11C11/23; G11C13/00; G11C13/04; H03; H03M; H03M1/00; H03M1/12; H03M1/22; H03M1/32
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) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |