Patent US2569872A successfully refreshed from Google Patents.
US2569872A
Expired / Lapsed
US
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Electron discharge tube
Assignee: Machlett Laboratories Inc
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Filing: 1949-12-24
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Granted: 1951-10-02
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Expires: 1969-12-24
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Skehan
- 👤 Thomas H Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:50
CPC Classifications
H; H01; H01J; H01J3/00; H01J3/02; H01J3/029; H01J35/00; H01J35/24; H01J35/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |