US2738465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Equalizer
Assignee: AT&T Inc
•
Filing: 1951-05-05
•
Granted: 1956-03-13
•
Expires: 1971-05-05
Abstract
No abstract record available.
Inventors
- 👤 Elmer A Schramm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:08
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/14; H04B3/143; H04B3/145
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1606817A
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US1967250A
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US2045991A
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US2019624A
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US2096027A
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US2153743A
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GB509141A
Cited
US2198684A
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US2222043A
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US2265042A
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US2337399A
Cited
US2637779A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-13 | 1959-09-12 | 1960-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-13 | 1963-09-12 | 1964-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-13 | 1967-09-12 | 1968-03-13 | $7700.00 | Window Closed / Lapsed |