Patent US2163270A successfully refreshed from Google Patents.
US2163270A
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US
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Electron discharge device
Assignee: Koninklijke Philips NV
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Filing: 1937-07-20
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Granted: 1939-06-20
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Expires: 1957-07-20
Abstract
No abstract record available.
Inventors
- 👤 Coeterier Frederik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:47
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/50; H01J31/503; H01J29/00; H01J29/02; H01J29/023; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-06-19 | 1942-12-19 | 1943-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-06-19 | 1946-12-19 | 1947-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-06-19 | 1950-12-19 | 1951-06-20 | $7700.00 | Window Closed / Lapsed |