Patent US3535598A successfully refreshed from Google Patents.
US3535598A
Expired / Lapsed
US
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Solid state tunnel cathode emitter having an improved thin film insulating barrier
Assignee: Raytheon Co
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Filing: 1969-05-23
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Granted: 1970-10-20
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Expires: 1989-05-23
Abstract
No abstract record available.
Inventors
- 👤 Wolfgang M Feist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:23
CPC Classifications
B; B82; B82Y; B82Y10/00; H; H01; H01J; H01J1/00; H01J1/02; H01J1/30; H01J1/312
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3259759A
Cited
US3184636A
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US3359466A
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US3184659A
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US3150282A
Cited
US3373051A
Cited
US3445281A
Cited
US3447043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |