US2473939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarized electromagnet
Assignee: Thomas A Edison Inc
•
Filing: 1945-10-22
•
Granted: 1949-06-21
•
Expires: 1965-10-22
Abstract
No abstract record available.
Inventors
- 👤 Winslow B M Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:03
CPC Classifications
G; G01; G01R; G01R5/00; G01R5/14; G01R5/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1452591A
Cited
US698027A
Cited
US2145821A
Cited
US2339021A
Cited
US2345011A
Cited
US2437726A
Cited
US2446579A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-20 | 1952-12-20 | 1953-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-20 | 1956-12-20 | 1957-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-20 | 1960-12-20 | 1961-06-21 | $7700.00 | Window Closed / Lapsed |