US2491847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric discharge envelope
Assignee: General Electric Co
•
Filing: 1946-06-21
•
Granted: 1949-12-20
•
Expires: 1966-06-21
Abstract
No abstract record available.
Inventors
- 👤 Breadner Robert Leonard
- 👤 Jenkins Henry Grainger
- 👤 Simms Charles Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:39
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/32; H01J61/327; C; C03; C03B; C03B23/00; C03B23/20; H01J5/00; H01J5/20; H01J5/22; H01J5/24; H01J61/305; H01J61/307; H01J2893/00; H01J2893/0033; H01J2893/0037; H01J2893/0038; H01J2893/0039
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1935423A
Cited
US1867154A
Cited
US1984215A
Cited
US1926552A
Cited
US2205672A
Cited
US2255431A
Cited
US2316348A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |