Patent US6270509B1 successfully refreshed from Google Patents.
US2686885A
Expired / Lapsed
US
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Insulated coated grid for electron discharge devices
Assignee: GTE Sylvania Inc
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Filing: 1949-11-26
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Granted: 1954-08-17
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Expires: 1969-11-26
Abstract
No abstract record available.
Inventors
- 👤 Richard C Bailin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:06
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/42; H01J2893/00; H01J2893/0001; H01J2893/0002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR749053A
Cited
US2000990A
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US2092804A
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US2217427A
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US2254140A
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US2430218A
Cited
US2442378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |