US3048677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching device
Assignee: AT&T Inc
•
Filing: 1961-03-31
•
Granted: 1962-08-07
•
Expires: 1981-03-31
Abstract
No abstract record available.
Inventors
- 👤 Edward C Hellstrom
- 👤 Jr Charles E Pollard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:58
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/28; H01H51/284; H01H51/285
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2609464A
Cited
US2872546A
Cited
US2844687A
Cited
US2965733A
Cited
US2992306A
Cited
US2995637A
Cited
US3001049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-06 | 1966-02-05 | 1966-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-06 | 1970-02-05 | 1970-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-06 | 1974-02-05 | 1974-08-07 | $7700.00 | Window Closed / Lapsed |