US2809314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field emission ion source
Assignee: High Voltage Engineering Corp
•
Filing: 1956-01-27
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Granted: 1957-10-08
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Expires: 1976-01-27
Abstract
No abstract record available.
Inventors
- 👤 Raymond G Herb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:08
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/30; H01J1/304; H01J27/00; H01J27/02; H01J27/26; H01J2237/00; H01J2237/06; H01J2237/08; H01J2237/0802; H01J2237/0807
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2287620A
Cited
GB697105A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |