Patent US3500454A successfully refreshed from Google Patents.
US3500454A
Expired / Lapsed
US
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Insulator heater coating for heater-cathode assembly
Assignee: GTE Sylvania Inc
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Filing: 1967-11-16
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Granted: 1970-03-10
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Expires: 1987-11-16
Abstract
No abstract record available.
Inventors
- 👤 Lloyd C Emerick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:55
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US792001A
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US1618499A
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US1954474A
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US2677782A
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US2749470A
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DE1090774B
Cited
US3195004A
Cited
US3262814A
Cited
US3161540A
Cited
US3305405A
Cited
US3328201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-09 | 1973-09-08 | 1974-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-09 | 1977-09-08 | 1978-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-09 | 1981-09-08 | 1982-03-10 | $7700.00 | Window Closed / Lapsed |