Patent US2491540A successfully refreshed from Google Patents.
Patent US2709306A successfully refreshed from Google Patents.
US2709306A
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US
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Method and apparatus for treating pulverulent, granular, and like materials by a gaseous medium
Assignee: Svenska Flaktfabriken AB
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Filing: 1952-01-02
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Granted: 1955-05-31
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Expires: 1972-01-02
Abstract
No abstract record available.
Inventors
- 👤 Magnusson Folke
- 👤 Hallberg Goran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:02
CPC Classifications
F; F26; F26B; F26B11/00; F26B11/02; F26B11/028
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
121 words
A METHOD OF TREATING PULVERULENT, GRANULAR AND LIKE MATERIAL BY MEANS OF A GASEOUS MEDIUM COMPRISING THE STEPS OF INTRODCUING THE MATERIAL INTO ONE END OF A CHAMBER, CAUSING THE MATERIAL TO TRAVEL LONGITUDINALLY THROUGH THE CHAMBER AND OUT OF THE OTHER END, CONVEYING THE MATERIAL FROM THE BOTTOM OF THE CHAMBER TO THE TOP THEREOF DURING ITS LONGITUDINAL TRAVEL, ALLOWING THE MATERIAL TO FALL FREELY BACK TO THE BOTTOM OF THE CHAMBER IN A CONTINUOUS LONGITUDINAL CURTAIN OF MATERIAL DIVIDING THE CHAMBER INTO TWO PARTS, AND DIRECTING THE GASEOUS MEDIUM IN A NARROW STREAM TRANVERSELY THROUGH THE CURTAIN OF MATERIAL IN A DIRECTION ASSISTING THE LONGITUDINAL TRAVEL OF THE MTERIAL THROUGH THE CHAMBER TO THEREBY EFFECT TREATMENT OF THE MATERIAL.
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) | 1958-05-30 | 1958-11-29 | 1959-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-30 | 1962-11-29 | 1963-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-30 | 1966-11-29 | 1967-05-31 | $7700.00 | Window Closed / Lapsed |