US2556716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relay
Assignee: AT&T Inc
•
Filing: 1947-04-25
•
Granted: 1951-06-12
•
Expires: 1967-04-25
Abstract
No abstract record available.
Inventors
- 👤 Walter E Viol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:23
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/02; H01H51/04; H01H51/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1847208A
Cited
US2069162A
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US2069171A
Cited
US1997655A
Cited
US2134945A
Cited
US2052319A
Cited
US2246301A
Cited
US2258122A
Cited
US2416569A
Cited
US2449221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |