US2841735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge tube
Assignee: US Philips Corp
•
Filing: 1955-03-15
•
Granted: 1958-07-01
•
Expires: 1975-03-15
Abstract
No abstract record available.
Inventors
- 👤 Rybakoff George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:03
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/32; H01J19/34; H01J2893/00; H01J2893/0001; H01J2893/0002; H01J2893/0003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1790152A
Cited
US1661436A
Cited
US1874753A
Cited
US2310147A
Cited
US2431144A
Cited
GB640239A
Cited
US2569847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |