US2640950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Point electron source
Assignee: United States Atomic Energy Commission
•
Filing: 1951-06-06
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Granted: 1953-06-02
•
Expires: 1971-06-06
Abstract
No abstract record available.
Inventors
- 👤 Leslie J Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:34
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2107945A
Cited
US2131204A
Cited
GB488948A
Cited
US2201167A
Cited
US2175695A
Cited
US2173259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |