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Patent US2654822A successfully refreshed from Google Patents.
US2654822A
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Method of sealing the envelopes of vacuum tubes
Assignee: Machlett Laboratories Inc
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Filing: 1949-09-30
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Granted: 1953-10-06
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Expires: 1969-09-30
Abstract
No abstract record available.
Inventors
- 👤 George J Agule
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:19
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/20; H01J5/22; H01J5/28; H01J2893/00; H01J2893/0033; H01J2893/0037; H01J2893/0044
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2226944A
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US2276847A
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US2229436A
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US2438721A
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US2411439A
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US2428610A
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US2463158A
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US2441353A
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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) | 1956-10-05 | 1957-04-06 | 1957-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-05 | 1961-04-06 | 1961-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-05 | 1965-04-06 | 1965-10-06 | $7700.00 | Window Closed / Lapsed |