US2131035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic speed changer
Assignee: O S WALKER CO Inc
•
Filing: 1935-12-24
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Granted: 1938-09-27
•
Expires: 1955-12-24
Abstract
No abstract record available.
Inventors
- 👤 John T Beechlyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:21
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/10; H02K49/104; H02K49/106
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-09-26 | 1942-03-28 | 1942-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-09-26 | 1946-03-28 | 1946-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-09-26 | 1950-03-28 | 1950-09-27 | $7700.00 | Window Closed / Lapsed |