US2916668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat stabilized field emission electron sources
Assignee: Research Corp
•
Filing: 1955-07-01
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Granted: 1959-12-08
•
Expires: 1975-07-01
Abstract
No abstract record available.
Inventors
- 👤 Walter P Dyke
- 👤 John P Barbour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:49
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/06; H01J35/065; H01J1/00; H01J1/02; H01J1/30; H01J1/304
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1522305A
Cited
US1639805A
Cited
US1749780A
Cited
US1699146A
Cited
US2156752A
Cited
US2786955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-07 | 1963-06-08 | 1963-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-07 | 1967-06-08 | 1967-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-07 | 1971-06-08 | 1971-12-08 | $7700.00 | Window Closed / Lapsed |