US2871874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacity level control with adjustable span control
Assignee: Robertshaw Controls Co
•
Filing: 1954-10-15
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Granted: 1959-02-03
•
Expires: 1974-10-15
Abstract
No abstract record available.
Inventors
- 👤 Ralph V Coles
- 👤 Frederick L Maltby
- 👤 Joseph W Philippi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:23
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/26; G01F23/263; G01F23/265; G05; G05D; G05D9/00; G05D9/12; H; H01; H01H; H01H47/00; H01H47/02; H01H47/20; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7306; Y10T137/7358; Y10T137/7413
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2124018A
Cited
US2213961A
Cited
GB663643A
Cited
US2655933A
Cited
US2635225A
Cited
US2763283A
Cited
US2707482A
Cited
US2672880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-02 | 1962-08-04 | 1963-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-02 | 1966-08-04 | 1967-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-02 | 1970-08-04 | 1971-02-03 | $7700.00 | Window Closed / Lapsed |