US2428569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Step-by-step actuator for electromagnetic switches
Assignee: EXPRESS LIFT CO Ltd
•
Filing: 1943-12-15
•
Granted: 1947-10-07
•
Expires: 1963-12-15
Abstract
No abstract record available.
Inventors
- 👤 Stanley T Hunt
- 👤 Frederick W F Goffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:51
CPC Classifications
H; H01; H01H; H01H63/00; H01H63/16; H01H63/24; H01H63/28; H01H63/32; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1526; Y10T74/1553; Y10T74/1555; Y10T74/20; Y10T74/20576; Y10T74/20582; Y10T74/2063
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-06 | 1951-04-07 | 1951-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-06 | 1955-04-07 | 1955-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-06 | 1959-04-07 | 1959-10-07 | $7700.00 | Window Closed / Lapsed |