Patent US3690227A successfully refreshed from Google Patents.
Patent US2840454A successfully refreshed from Google Patents.
US2840454A
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Method and apparatus for recovering heat and chemicals from the residual liquor resulting from the digestion of cellulosic fibrous material in an alkaline liquor
Assignee: HOWARD SMITH PAPER MILLS Ltd
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Filing: 1946-01-10
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Granted: 1958-06-24
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Expires: 1966-01-10
Abstract
No abstract record available.
Inventors
- 👤 George H Tomlinson
- 👤 Ii George H Tomlinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:52
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/06; D21C11/063; Y; Y02; Y02P; Y02P70/00; Y02P70/10; Y10; Y10S; Y10S261/00; Y10S261/09; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
THE METHOD OF RECOVERING HEAT AND CHEMICALS FROM THE RESIDUAL LIQUOR RESULTING FROM THE DIGESTION OF CELLULOSIC FIBROUS MATERIAL IN AN ALKALINE COOKING LIQUOR WHICH COMPRISES CONCENTRATING THE RESIDUAL LIQUOR AND ABSORBING GASEOUS SULPHUR OXIDES THEREIN BY A DIRECT INTIMATE CONTACT OF THE RESIDUAL LIQUOR WITH HOT FLUE GASES CONTAINING GASEOUS SULPHUR OXIDES AND CHEMICAL FUNE PARTICLES, CENTRIFUGALLY SEPARATING RESIDUAL LIQUOR ENTRAINED IN THE FLUE GASES AS A RESULT OF SAID LIQUOR-GAS CONTACT FROM THE FLUE GASES, PASSING THE FLUE GASES AFTER CENTRIFUGALLY SEPARATING SUBSTANTIALLY ALL OF THE RESIDUAL LIQUOR THEREFROM THROUGH A FUME RECOVERY ZONE IN INTIMATE CONTACT WITH A RECIRCULATED AQUEOUS LIQUID, WITHDRAWING THE RECOVERD FUME FROM THE FUME RECOVERY ZONE IN SAID AQUEOUS LIQUID, ADDING MAKE-UP WATER TO THE AQUEOUS LIQUID, CONCENTRAT-
Claim 2
Independent Claim
125 words
THE METHOD OF RECOVERING HEAT AND CHEMICALS FROM THE RESIDUAL LIQUOR RESULTING FROM THE DIGESTION OF CELLULOSIC FIBROUS MATERIAL IN AN ALKALINE COOKING LIQUOR WHICH COMPRISES CONCENTRATING THE RESIDUAL LIQUOR AND ABSORBING GASEOUS SULPHUR OXIDES THEREIN BY A DIRECT INTIMATE CONTACT OF THE RESIDUAL LIQUOR WITH HOT FLUE GASES CONTAINING GASEOUS SULPHUR OXIDES AND CHEMICAL FUNE PARTICLES, CENTRIFUGALLY SEPARATING RESIDUAL LIQUOR ENTRAINED IN THE FLUE GASES AS A RESULT OF SAID LIQUOR-GAS CONTACT FROM THE FLUE GASES, PASSING THE FLUE GASES AFTER CENTRIFUGALLY SEPARATING SUBSTANTIALLY ALL OF THE RESIDUAL LIQUOR THEREFROM THROUGH A FUME RECOVERY ZONE IN INTIMATE CONTACT WITH A RECIRCULATED AQUEOUS LIQUID, WITHDRAWING THE RECOVERD FUME FROM THE FUME RECOVERY ZONE IN SAID AQUEOUS LIQUID, ADDING MAKE-UP WATER TO THE AQUEOUS LIQUID, CONCENTRAT-
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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) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |