US2531882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic step-by-step switch
Assignee: International Business Machines Corp
•
Filing: 1946-11-27
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Granted: 1950-11-28
•
Expires: 1966-11-27
Abstract
No abstract record available.
Inventors
- 👤 Curt I Johnson
- 👤 Karl R Stauss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:45
CPC Classifications
G; G06; G06M; G06M1/00; G06M1/08; G06M1/10; G06M1/102; G06M1/104; H; H01; H01H; H01H51/00; H01H51/02; H01H51/04; H01H51/06; H01H51/08; H01H51/082; H01H51/086; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1558; Y10T74/1565; Y10T74/1576
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |