US2670405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signaling system employing electron beams
Assignee: AT&T Inc
•
Filing: 1948-06-10
•
Granted: 1954-02-23
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Expires: 1968-06-10
Abstract
No abstract record available.
Inventors
- 👤 Milton E Mohr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:28
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/02; H01J31/06; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/525
Claims Analysis
Total Claims: 0
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US2452157A
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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) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |