Patent US2567415A successfully refreshed from Google Patents.
US2567415A
Expired / Lapsed
US
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Grid assembly and method of fabrication
Assignee: AT&T Inc
•
Filing: 1948-09-30
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Granted: 1951-09-11
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Expires: 1968-09-30
Abstract
No abstract record available.
Inventors
- 👤 Edward J Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:52
CPC Classifications
H; H01; H01J; H01J19/00; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/0022; H01J2893/0024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1266614A
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US1654899A
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US1897880A
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US1974298A
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US2210489A
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US2473220A
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US2398609A
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US2321840A
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US2434494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-10 | 1955-03-12 | 1955-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-10 | 1959-03-12 | 1959-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-10 | 1963-03-12 | 1963-09-11 | $7700.00 | Window Closed / Lapsed |