US3402889A
Expired / Lapsed
US
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Flow control systems having combined modulation and pressure regulation of a fluid flow
Assignee: Robertshaw Controls Co
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Filing: 1967-06-05
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Granted: 1968-09-24
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Expires: 1987-06-05
Abstract
No abstract record available.
Inventors
- 👤 James R Willson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:36
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/06; G05D16/063; G05D16/0675; G05D16/0697; F; F23; F23N; F23N1/00; F23N1/007; F23N5/00; F23N5/02; F23N5/10; F23N5/105; G05D16/14; G05D16/16; G05D16/163; F23N2235/00; F23N2235/12; F23N2235/16; F23N2235/20; F23N2235/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |