US2108642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic device
Assignee: AT&T Inc
•
Filing: 1936-08-20
•
Granted: 1938-02-15
•
Expires: 1956-08-20
Abstract
No abstract record available.
Inventors
- 👤 Edward M Boardman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:07
CPC Classifications
H; H03; H03F; H03F9/00; H03F9/02; H04; H04L; H04L25/00; H04L25/02; H04L25/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-02-14 | 1941-08-16 | 1942-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-02-14 | 1945-08-16 | 1946-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-02-14 | 1949-08-16 | 1950-02-15 | $7700.00 | Window Closed / Lapsed |