US2416338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency selective system
Assignee: AT&T Inc
•
Filing: 1945-04-11
•
Granted: 1947-02-25
•
Expires: 1965-04-11
Abstract
No abstract record available.
Inventors
- 👤 Warren P Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:15
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30; G; G01; G01H; G01H3/00; G01H3/04; G01H3/06; G10; G10K; G10K11/00; G10K11/18; G10K11/22; H03H9/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2169304A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-02-24 | 1950-08-26 | 1951-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-24 | 1954-08-26 | 1955-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-24 | 1958-08-26 | 1959-02-25 | $7700.00 | Window Closed / Lapsed |