US2834946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field displacement isolator
Assignee: AT&T Inc
•
Filing: 1955-04-25
•
Granted: 1958-05-13
•
Expires: 1975-04-25
Abstract
No abstract record available.
Inventors
- 👤 Frank J Sansalone
- 👤 Weisbaum Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:27
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34; H01F1/342; H01F1/344; H01P; H01P1/00; H01P1/32; H01P1/36; H01P1/37
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2705780A
Cited
US2776412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |