US2951186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for alternately energizing two electromagnetic devices
Assignee: International Business Machines Corp
•
Filing: 1958-05-19
•
Granted: 1960-08-30
•
Expires: 1978-05-19
Abstract
No abstract record available.
Inventors
- 👤 Wesley E Dickinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:21
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/01; G05B11/011; H; H03; H03K; H03K17/00; H03K17/51; H03K17/54; H03K17/56; H03K17/60; H03K17/64
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2538789A
Cited
US2717977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-30 | 1964-02-29 | 1964-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-30 | 1968-02-29 | 1968-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-30 | 1972-02-29 | 1972-08-30 | $7700.00 | Window Closed / Lapsed |