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US2981274A
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Apparatus for controlling a variable quantity such as temperature or pressure
Assignee: Alfa Laval Holdings Amsterdam AB
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Filing: 1957-11-20
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Granted: 1961-04-25
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Expires: 1977-11-20
Abstract
No abstract record available.
Inventors
- 👤 Wennerberg Fritz Johan
- 👤 Hansen Knut Bonde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:30
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/185; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2536198A
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US2762385A
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US2808725A
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US2776670A
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US2743710A
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US2769453A
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US2790427A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |