US2531600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron beam tube filter
Assignee: AT&T Inc
•
Filing: 1949-02-04
•
Granted: 1950-11-28
•
Expires: 1969-02-04
Abstract
No abstract record available.
Inventors
- 👤 Harold L Barney
- 👤 Liss C Peterson
- 👤 Ralph K Potter
- 👤 Raymond W Sears
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:40
CPC Classifications
H; H03; H03H; H03H15/00; H01; H01J; H01J19/00; H01J29/00; H01J29/02; H01J31/00; H01J31/08; H01J31/58; H01J31/60; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/0022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2175573A
Cited
US2237655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |