US2539370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic electron lens system
Assignee: EMI Ltd
•
Filing: 1949-12-20
•
Granted: 1951-01-23
•
Expires: 1969-12-20
Abstract
No abstract record available.
Inventors
- 👤 Mayo Bernard Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:22
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/58; H01J29/62; H01J29/622; H01J29/624; H01J31/00; H01J31/08; H01J31/50; H01J31/501
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2176974A
Cited
US2131185A
Cited
US2189321A
Cited
US2264709A
Cited
US2185378A
Cited
US2219117A
Cited
US2320582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |