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Patent US3484643A successfully refreshed from Google Patents.
US3484643A
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Boron carbide cathode for cold emission type cathode of the field emission type
Assignee: Physics International Co
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Filing: 1966-12-01
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Granted: 1969-12-16
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Expires: 1986-12-01
Abstract
No abstract record available.
Inventors
- 👤 William T Link
- 👤 William C Olander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:33
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/30; H01J1/304
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1596747A
Cited
US2040752A
Cited
US2232093A
Cited
US2654045A
Cited
US3259773A
Cited
US3259782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-15 | 1973-06-16 | 1973-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-15 | 1977-06-16 | 1977-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-15 | 1981-06-16 | 1981-12-16 | $7700.00 | Window Closed / Lapsed |