US2587983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic device operable by alternating current
Assignee: SPX Technologies Inc
•
Filing: 1950-01-07
•
Granted: 1952-03-04
•
Expires: 1970-01-07
Abstract
No abstract record available.
Inventors
- 👤 Paul H Durand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:21
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/10; H01F7/12; Y; Y10; Y10T; Y10T292/00; Y10T292/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1899502A
Cited
US1890525A
Cited
US2027221A
Cited
US2096929A
Cited
US2140576A
Cited
US2336782A
Cited
US2416681A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-04 | 1955-09-03 | 1956-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-04 | 1959-09-03 | 1960-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-04 | 1963-09-03 | 1964-03-04 | $7700.00 | Window Closed / Lapsed |