US2950998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for contacting solids with liquids
Assignee: Chemetron Corp
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Filing: 1956-03-01
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Granted: 1960-08-30
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Expires: 1976-03-01
Abstract
No abstract record available.
Inventors
- 👤 Stewart Robert Marshall
- 👤 Wallace P Sevin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:35
CPC Classifications
C; C13; C13B; C13B10/00; C13B10/08; C13B10/10; C13B10/102; B; B01; B01D; B01D11/00; B01D11/02; B01D11/0215; B01D11/0223; B01D11/0226
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
APPARATUS FOR CONTINUOUSLY CONVEYING SOLID MATERIALS UPWARDLY THROUGH LIQUID MEDIA, COMPRISING IN COMBINATION, A CYLINDRICAL ENVELOPE HAVING AN INTERRUPTED SPIRAL ARRANGEMENT OF FLIGHTS DISPOSED ABOUT A CENTRAL SHAFT JOURNALLED FOR ROTATION IN THE ENVELOPE IN SUCH MANNER THAT THE TRAILING EDGE OF ONE FLIGHT SEGMENT AND THE LEADING EDGE OF THE NEXT FLIGHT SEGMENT IN THE SPIRAL ARRANGEMENT OF FLIGHTS ARE SUBSTANTIALLY IN ALIGNMENT IN THE AXIAL DIRECTION OF THE CENTRAL SHAFT AND SUBSTANTIALLY WITHOUT OVERLAP, AND AT LEAST ONE DEFLECTOR MEMBER EXTENDING FROM THE EVELOPE INTO EACH OF THE INTERRUPTIONS OF THE FLIGHTS, THE DEFLECTOR MEMBERS THAT EXTEND INTO ADJACENT FLIGHT INTERRUPTIONS BEING LONGITUDINALLY AND RADICALLY DISPLACED ONE FROM ANOTHER, AND WHEREIN THE ANGLE INCLUDED BETWEEN THE LEADING EDGE AND THE TRAILING EDGE OF A FLIGHT IS EQUAL TO 180 DEGREES DIVIDED BY THE NUMBER OF HELICES DEFINED BY THE FLIGHTS.
Claim 2
Dependent Claim
142 words
APPARATUS FOR CONTINUOUSLY CONVEYING SOLID MATERIALS UPWARDLY THROUGH LIQUID MEDIA, COMPRISING IN COMBINATION, A CYLINDRICAL ENVELOPE HAVING AN INTERRUPTED SPIRAL ARRANGEMENT OF FLIGHTS DISPOSED ABOUT A CENTRAL SHAFT JOURNALLED FOR ROTATION IN THE ENVELOPE IN SUCH MANNER THAT THE TRAILING EDGE OF ONE FLIGHT SEGMENT AND THE LEADING EDGE OF THE NEXT FLIGHT SEGMENT IN THE SPIRAL ARRANGEMENT OF FLIGHTS ARE SUBSTANTIALLY IN ALIGNMENT IN THE AXIAL DIRECTION OF THE CENTRAL SHAFT AND SUBSTANTIALLY WITHOUT OVERLAP, AND AT LEAST ONE DEFLECTOR MEMBER EXTENDING FROM THE EVELOPE INTO EACH OF THE INTERRUPTIONS OF THE FLIGHTS, THE DEFLECTOR MEMBERS THAT EXTEND INTO ADJACENT FLIGHT INTERRUPTIONS BEING LONGITUDINALLY AND RADICALLY DISPLACED ONE FROM ANOTHER, AND WHEREIN THE ANGLE INCLUDED BETWEEN THE LEADING EDGE AND THE TRAILING EDGE OF A FLIGHT IS EQUAL TO 180 DEGREES DIVIDED BY THE NUMBER OF HELICES DEFINED BY THE FLIGHTS.
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) | 1963-08-30 | 1964-02-29 | 1964-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-30 | 1968-02-29 | 1968-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-30 | 1972-02-29 | 1972-08-30 | $7700.00 | Window Closed / Lapsed |