US2496643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impedance matching system
Assignee: AT&T Inc
•
Filing: 1944-10-14
•
Granted: 1950-02-07
•
Expires: 1964-10-14
Abstract
No abstract record available.
Inventors
- 👤 Phillip H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:07
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/04; H01P7/00; H01P7/06; H01Q; H01Q13/00; H01Q13/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1927393A
Cited
US1929878A
Cited
US2184729A
Cited
US2184771A
Cited
US2241582A
Cited
US2258953A
Cited
US2422191A
Cited
US2432093A
Cited
US2438914A
Cited
US2422184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |