US2507434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pool type cathode with means for accelerating arc formation
Assignee: Individual
•
Filing: 1948-07-14
•
Granted: 1950-05-09
•
Expires: 1968-07-14
Abstract
No abstract record available.
Inventors
- 👤 Lany Beatrice Pearson De
- 👤 Paul L Copeland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:10
CPC Classifications
H; H01; H01J; H01J13/00; H01J13/02; H01J2893/00; H01J2893/0072; H01J2893/0073
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE368998C
Cited
US1285947A
Cited
US1178542A
Cited
US1126877A
Cited
US1223428A
Cited
US1246470A
Cited
US2016885A
Cited
US2438668A
Cited
US2458205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-08 | 1953-11-07 | 1954-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-08 | 1957-11-07 | 1958-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-08 | 1961-11-07 | 1962-05-09 | $7700.00 | Window Closed / Lapsed |