US3444897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible flow control device
Assignee: Dole Valve Co
•
Filing: 1967-02-28
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Granted: 1969-05-20
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Expires: 1987-02-28
Abstract
No abstract record available.
Inventors
- 👤 Howard L Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:44
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/02; F16L55/027; G; G05; G05D; G05D7/00; G05D7/01; G05D7/0106; G05D7/012
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2899979A
Cited
US2500750A
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US2454929A
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US2572244A
Cited
US2728355A
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US2775984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |