US2286283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiplying operating mechanism for permeability tuning purposes
Assignee: Johnson Laboratories Inc
•
Filing: 1939-02-20
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Granted: 1942-06-16
•
Expires: 1959-02-20
Abstract
No abstract record available.
Inventors
- 👤 Martin J Kirk
- 👤 Frederick N Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:33
CPC Classifications
H; H01; H01F; H01F21/00; H01F21/02; H01F21/06; H01F21/065; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18888; Y10T74/1892; Y10T74/18928
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) | 1945-06-15 | 1945-12-15 | 1946-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-06-15 | 1949-12-15 | 1950-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-06-15 | 1953-12-15 | 1954-06-16 | $7700.00 | Window Closed / Lapsed |