Patent US2540728A successfully refreshed from Google Patents.
US2540728A
Expired / Lapsed
US
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Condition control system with stepped response
Assignee: WHEELCO INSTR Co
•
Filing: 1946-03-14
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Granted: 1951-02-06
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Expires: 1966-03-14
Abstract
No abstract record available.
Inventors
- 👤 Fred A Hansen
- 👤 Fryxell Olaf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:35
CPC Classifications
G; G05; G05B; G05B1/00; G05B1/01; G05B1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2295471A
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US1650889A
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US1838084A
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US1944988A
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US1841559A
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FR750075A
Cited
US2154260A
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US2165510A
Cited
US2218502A
Cited
US2153986A
Cited
US2411247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |