US3194756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for digesting sludge and digester therefor
Assignee: Walker Process Equipment Inc
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Filing: 1960-09-15
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Granted: 1965-07-13
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Expires: 1980-09-15
Abstract
No abstract record available.
Inventors
- 👤 Walker James Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:48
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/28; C02F3/2866; C02F3/2873; Y; Y10; Y10S; Y10S159/00; Y10S159/905
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
140 words
IN THE TREATMENT OF SLUDGE FROM A WASTE TREATMENT PLANT, THE IMPROVEMENT COMPRISING: MAINTAINING IN A DIGESTER A BODY OF DIGESTING SLUDGE; MOVING THE CENTRAL PORTION OF THE DIGESTER CONTENTS GENERALLY VERTICALLY THEN OUTWARDLY AND RETURNING, ENTIRELY WITH A MAINLY RADIAL LAMINAR FLOW, WHICH AVOIDS EXTENSIVE MIXING OF SLUDGE FROM AREAS WIDELY SEPARATED ANGULARLY ABOUT A VERTICAL AXIS, BUT WITH A SLIGHT COMPONENT OF ROTARY MOVEMENT ABOUT THE VERTICAL AXIS, TO FORM A TOROIDAL ROLL SLOWLY ADVANCING CIRCUMFERENTIALLY; ADDING SUBSTANITALL ALL OF THE RAW SLUDGE AT AN OFF-CENTER POINT SWEPT BY SAID FLOW TO BE MIXED WITH THE PASSING CONTENTS AND TO LARGELY FOLLOW THEIR ADVANCING TOROIDAL PATH; AND WITHDRAWING THE MIXTURE FROM THE MAIN BODY SUBSTANITALLY ENTIRELY AT A POINT IN SAID PATH WHICH IS REMOTELY SPACED ANGULARLY ABOUT THE CENTRAL PORTION FROM THE POINT OF ADDING RAW SLUDGE.
Claim 2
Dependent Claim
140 words
IN THE TREATMENT OF SLUDGE FROM A WASTE TREATMENT PLANT, THE IMPROVEMENT COMPRISING: MAINTAINING IN A DIGESTER A BODY OF DIGESTING SLUDGE; MOVING THE CENTRAL PORTION OF THE DIGESTER CONTENTS GENERALLY VERTICALLY THEN OUTWARDLY AND RETURNING, ENTIRELY WITH A MAINLY RADIAL LAMINAR FLOW, WHICH AVOIDS EXTENSIVE MIXING OF SLUDGE FROM AREAS WIDELY SEPARATED ANGULARLY ABOUT A VERTICAL AXIS, BUT WITH A SLIGHT COMPONENT OF ROTARY MOVEMENT ABOUT THE VERTICAL AXIS, TO FORM A TOROIDAL ROLL SLOWLY ADVANCING CIRCUMFERENTIALLY; ADDING SUBSTANITALL ALL OF THE RAW SLUDGE AT AN OFF-CENTER POINT SWEPT BY SAID FLOW TO BE MIXED WITH THE PASSING CONTENTS AND TO LARGELY FOLLOW THEIR ADVANCING TOROIDAL PATH; AND WITHDRAWING THE MIXTURE FROM THE MAIN BODY SUBSTANITALLY ENTIRELY AT A POINT IN SAID PATH WHICH IS REMOTELY SPACED ANGULARLY ABOUT THE CENTRAL PORTION FROM THE POINT OF ADDING RAW SLUDGE.
Claim 3
Dependent Claim
92 words
IN A DIGESTER INLCUDING A TANK SUBSTANTIALLY CLOSED EXCEPT FOR GAS DRAWOFF MEANS, AN UPDRAFT TUBE AND MEANS FOR DISCHARGING GAS AT A SUBSTANITAL DEPTH THEREIN TO PRODUCE UPFLOW THROUGH THE TUBE FOR INDUCING A ROLLING MOVEMENT OF THE DIGESTER CONTENTS, THE UPDRAFT TUBE HAVING AN INLET, AN EXTENDED UPFLOW PORTION, AND AN OUTLET VERTICALLY ABOVE THE INLET AND SUBSTANITALLY WITHIN THE UPWARDLY PROJECTED AREA OF THE UPFLOW PORTION, THE IMPROVEMENT COMPRISING: STATIONARY SWIRL VANES OPERATIVELY CONNECTED TO THE UPDRAFT TUBE TO IMPART A COMPONENT OF CIRCUMFERENTIAL ROTATION TO THE ROLLING MOVEMENT.
Claim 4
Dependent Claim
92 words
IN A DIGESTER INLCUDING A TANK SUBSTANTIALLY CLOSED EXCEPT FOR GAS DRAWOFF MEANS, AN UPDRAFT TUBE AND MEANS FOR DISCHARGING GAS AT A SUBSTANITAL DEPTH THEREIN TO PRODUCE UPFLOW THROUGH THE TUBE FOR INDUCING A ROLLING MOVEMENT OF THE DIGESTER CONTENTS, THE UPDRAFT TUBE HAVING AN INLET, AN EXTENDED UPFLOW PORTION, AND AN OUTLET VERTICALLY ABOVE THE INLET AND SUBSTANITALLY WITHIN THE UPWARDLY PROJECTED AREA OF THE UPFLOW PORTION, THE IMPROVEMENT COMPRISING: STATIONARY SWIRL VANES OPERATIVELY CONNECTED TO THE UPDRAFT TUBE TO IMPART A COMPONENT OF CIRCUMFERENTIAL ROTATION TO THE ROLLING MOVEMENT.
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) | 1968-07-12 | 1969-01-11 | 1969-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-12 | 1973-01-11 | 1973-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-12 | 1977-01-11 | 1977-07-13 | $7700.00 | Window Closed / Lapsed |