Patent US2426990A successfully refreshed from Google Patents.
US2426990A
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Header for electron tubes and the like and method of manufacture
Assignee: GTE Sylvania Inc
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Filing: 1943-09-03
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Granted: 1947-09-09
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Expires: 1963-09-03
Abstract
No abstract record available.
Inventors
- 👤 Bennett S Ellefson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:50
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/24; H01J9/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE154609C
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US1301714A
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US2251726A
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US2296321A
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US2195485A
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US2312003A
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US2342609A
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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) | 1950-09-08 | 1951-03-10 | 1951-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-08 | 1955-03-10 | 1955-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-08 | 1959-03-10 | 1959-09-09 | $7700.00 | Window Closed / Lapsed |