US2889478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge apparatus
Assignee: International Standard Electric Corp
•
Filing: 1954-06-28
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Granted: 1959-06-02
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Expires: 1974-06-28
Abstract
No abstract record available.
Inventors
- 👤 Rogers Douglas Cecil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:24
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/94; H01J41/00; H01J41/02; H01J41/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2308800A
Cited
US2445811A
Cited
US2547200A
Cited
US2639397A
Cited
GB709266A
Cited
US2625586A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |