US3586510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical pump system and use in processing of foods
Assignee: United States Department of Agriculture
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Filing: 1969-06-13
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Granted: 1971-06-22
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Expires: 1989-06-13
Abstract
Abstract DEVICE FOR TREATING MATERIALS-E.G., FRUITS, VEGETABLES, AR GRAINS, PACKAGED FOODS, ETC-AT PRESSURES ABOVE OR BELOW ATOMOSPHERIC PRESSURE, WHICH INCLUDES A HELICAL PUMPING SYSTEM FOR CONVEYING THE MATERIAL INTO AND OUT OF THE TREATMENT ZONE WHEREBY THE INTEGRITY OF THE MATERIAL IS PRESERVED, EVEN WHERE IT IS OF A DELICATE NATURE AS IS THE CASE, FOR EXAMPLE, WITH BERRIES, PEACH HALVES, FOODS PACKAGED IN PLASTIC POUNCHES, ETC. A SPECIAL FEATURE OF THE HELICAL PUMP IS THE PROVISION OF AN AIR FEEDBACK ARRANGEMENT FOR INCREASING PUMPING EFFICIENCY AND FOR AVOIDING INSTABILITY DURING OPERATION.
Inventors
- 👤 Daniel Frederick Farkas
- 👤 William C Rockwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:13
CPC Classifications
A; A23; A23B; A23B7/00; A23B7/08; A23B2/00; A23B2/10; A23B2/103; A23B2/20; A23B2/25; A23B2/255; A23B2/40; A23B2/42; A23B2/46; A23B2/465; A23B2/70; A23B2/725; A23B7/14; A23B7/144; A23B7/153; A23B7/154; A23B7/157; A23B7/158; A23L; A23L5/00; A23L5/10; A23L5/11; A23L5/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |