Patent US2017726A successfully refreshed from Google Patents.
US2017726A
Expired / Lapsed
US
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Electric cathode glow device
Assignee: Siemens Electric Lamps and Supplies Ltd
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Filing: 1934-02-21
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Granted: 1935-10-15
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Expires: 1954-02-21
Abstract
No abstract record available.
Inventors
- 👤 Oakley Percy Dale
- 👤 Aldington John Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:47
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/64; H01J61/66
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) | 1938-10-14 | 1939-04-15 | 1939-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-10-14 | 1943-04-15 | 1943-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-10-14 | 1947-04-15 | 1947-10-15 | $7700.00 | Window Closed / Lapsed |