US2472942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron tube
Assignee: EITEL MCCUILOUGH Inc
•
Filing: 1947-03-18
•
Granted: 1949-06-14
•
Expires: 1967-03-18
Abstract
No abstract record available.
Inventors
- 👤 Drieschman Donald
- 👤 Chamberlin Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:29
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)
USRE21163E
Cited
US2175019A
Cited
US2121590A
Cited
US2178747A
Cited
US2413689A
Cited
US2416565A
Cited
US2367332A
Cited
US2423819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-13 | 1952-12-13 | 1953-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-13 | 1956-12-13 | 1957-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-13 | 1960-12-13 | 1961-06-14 | $7700.00 | Window Closed / Lapsed |