US2831587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidized solids conveyance
Assignee: MW Kellogg Co
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Filing: 1951-08-14
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Granted: 1958-04-22
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Expires: 1971-08-14
Abstract
No abstract record available.
Inventors
- 👤 John S Rearick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:54
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/34; B65G53/40; B65G53/48
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
134 words
AN APPARATUS COMPRISING IN COMBINATION AT LEAST TWO SCREW PUMPS, EACH SCREW PUMP BEING EQUIPPED WITH AN ELONGATED CIRCULAR CASING, A ROTATABLE SHAFT EXTENDING ALONG THE ENTIRE LENGTH OF THE CASING, SUPPORTING MEANS WHEREBY THE SHAFT IS SUPPORTED AND ROTATED, SCREW FLIGHTS SPRIRALING ALONG THE LENGTH OF THE SHAFT, A HOPPER SUPERIMPOSED ON ONE END OF THE CASING AND COMMUNICATING THEREWITH FOR THE PASSAGE OF MATERIALS THEREBETWEEN, AN OUTLET MEANS SITUATED ON THE END OF THE CASING OPPOSITE TO THE HOPPER WHEREBY MATERIALS ARE DISCHARGED FROM THE CASHING AN AERATION CHAMBER LATERALLY DISPOSED ON SAID CASING AND LOCATED DIRECTLY BELOW THE POSITION OF THE HOPPER, SAID AERATION CHAMBER HAVING A CROSS-SECTIONAL AREA WHICH IS AT LEAST AS GREAT AS THE CROSS-SECTIONAL AREA OF THE HOPPER AT THE PLACE WHERE IT IS CONNECTED TO THE
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) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |