US2816243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative ion source
Assignee: High Voltage Engineering Corp
•
Filing: 1956-04-09
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Granted: 1957-12-10
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Expires: 1976-04-09
Abstract
No abstract record available.
Inventors
- 👤 Raymond G Herb
- 👤 James A Weinman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:07
CPC Classifications
H; H01; H01J; H01J27/00; H01J27/02; H01J27/028; G; G21; G21K; G21K1/00; G21K1/14; H05; H05H; H05H7/00; H05H7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2232030A
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US2498841A
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US2489344A
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US2642535A
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US2643341A
Cited
US2570124A
Cited
US2677061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |