Patent USD287724S successfully refreshed from Google Patents.
US2724742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suppressed-carrier amplitude modulation
Assignee: AT&T Inc
•
Filing: 1951-05-05
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Granted: 1955-11-22
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Expires: 1971-05-05
Abstract
No abstract record available.
Inventors
- 👤 Florence P Chesnut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:02
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1810326A
Cited
US1998119A
Cited
US2034826A
Cited
GB480847A
Cited
US2186958A
Cited
US2530614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-21 | 1959-05-23 | 1959-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-21 | 1963-05-23 | 1963-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-21 | 1967-05-23 | 1967-11-22 | $7700.00 | Window Closed / Lapsed |