US2521828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coaxial line attenuator
Assignee: AT&T Inc
•
Filing: 1946-06-25
•
Granted: 1950-09-12
•
Expires: 1966-06-25
Abstract
No abstract record available.
Inventors
- 👤 Earl L Chatterton
- 👤 John G Mooring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:18
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/202; G; G01; G01R; G01R21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1586533A
Cited
US1957538A
Cited
US1905353A
Cited
US2226238A
Cited
US2242874A
Cited
US2416694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |