US2413731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of electron discharge devices
Assignee: AT&T Inc
•
Filing: 1942-11-02
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Granted: 1947-01-07
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Expires: 1962-11-02
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:25
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/42; H01J19/46; H01J2893/00; H01J2893/0001; H01J2893/0002; H01J2893/0005; H01J2893/0006; Y; Y10; Y10S; Y10S264/00; Y10S264/44; Y10S425/00; Y10S425/012
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) | 1950-01-06 | 1950-07-08 | 1951-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-01-06 | 1954-07-08 | 1955-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-01-06 | 1958-07-08 | 1959-01-07 | $7700.00 | Window Closed / Lapsed |