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US2569456A
Expired / Lapsed
US
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Control device
Assignee: Pennsylvania Salt Manufacturing Co
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Filing: 1947-05-01
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Granted: 1951-10-02
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Expires: 1967-05-01
Abstract
No abstract record available.
Inventors
- 👤 Russell E Cushing
- 👤 Ross L Swenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:19
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/01; G05B11/012; G05B11/013
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1924459A
Cited
GB444673A
Cited
US2112682A
Cited
US2184576A
Cited
US2302889A
Cited
US2275317A
Cited
US2367746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |