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US2834900A
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Grid structure
Assignee: AT&T Inc
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Filing: 1956-08-30
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Granted: 1958-05-13
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Expires: 1976-08-30
Abstract
No abstract record available.
Inventors
- 👤 John A Mccarthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:24
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/08; H01J31/00; H01J31/08; H01J31/58; H01J31/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2538836A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |