Patent US2581945A successfully refreshed from Google Patents.
US2581945A
Expired / Lapsed
US
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Apparatus for sealing-in electron tubes and the like
Assignee: GTE Sylvania Inc
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Filing: 1943-11-27
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Granted: 1952-01-08
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Expires: 1963-11-27
Abstract
No abstract record available.
Inventors
- 👤 Robert F Doran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:54
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/20; H01J5/22; H01J5/24; H01J2893/00; H01J2893/0033; H01J2893/0037; H01J2893/0038; H01J2893/0039
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US565576A
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US1955058A
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US2082848A
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US2089044A
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US2131923A
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US2237186A
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US2296579A
Cited
US2268510A
Cited
US2334001A
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US2334123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |