US2500646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visual representation of complex waves
Assignee: AT&T Inc
•
Filing: 1946-11-23
•
Granted: 1950-03-14
•
Expires: 1966-11-23
Abstract
No abstract record available.
Inventors
- 👤 Robert R Riesz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:10
CPC Classifications
G; G10; G10L; G10L21/00; G10L21/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1654068A
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US1794393A
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US1994232A
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US2084760A
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US2051153A
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US2137888A
Cited
US2088297A
Cited
US2231971A
Cited
US2403986A
Cited
US2425003A
Cited
US2416353A
Cited
US2403983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |