Patent US3489554A successfully refreshed from Google Patents.
US3489554A
Expired / Lapsed
US
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Art of producing emitter-type electrode structures
Assignee: GTE Sylvania Inc
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Filing: 1969-03-13
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Granted: 1970-01-13
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Expires: 1989-03-13
Abstract
No abstract record available.
Inventors
- 👤 Craig T Waldo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:51
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/022; H01J9/025; B; B22; B22F; B22F5/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12139
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1671953A
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US2117636A
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US2488731A
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US2492142A
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US2609470A
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US2700118A
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US2914402A
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US3159461A
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US3269804A
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US3275435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |