US3255887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sludge digester
Assignee: Walker Process Equipment Inc
•
Filing: 1963-02-18
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Granted: 1966-06-14
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Expires: 1983-02-18
Abstract
No abstract record available.
Inventors
- 👤 Walker James Donald
- 👤 Nelson Alfred Washington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:26
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/28; C02F3/2866; C02F3/2873; Y; Y10; Y10S; Y10S210/00; Y10S210/09; Y10S261/00; Y10S261/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
IN A DIGESTER HAVING A FLOATING ROOF WITH A GIVEN RANGE OF VERTICAL TRAVEL, AND A BASE, THE IMPROVEMENT COMPRISING: A VERTICAL UPDRAFT TUBE HAVING TELESCOPING UPPER AND LOWER PORTIONS, SAID LOWER PORTION BEING STATIONARY AND BEING MOUNTED ON SAID BASE IN THE CENTRAL PORTION THEREOF, SAID PORTIONS BEING FREE TO TELESCOPE A DISTANCE AT LEAST APPROXIMATELY EQUAL TO THE AMOUNT OF ROOF TRAVEL, THE END OF THE OUTER PORTION, WHICH END IS ADJACENT THE INNER PORTION, BEING FLARED OUTWARDLY, THE UPPER PORTION INCLUDING A DOUBLE-WALLED, ANNULAR HEAT EXCHANGER; SAID ROOF HAVING A CENTRAL PART MOUNTED ON AND REMOVABLE FROM THE REMAINDER OF THE ROOF; A PAIR OF PIPES AFFIXED TO AND EXTENDING THROUGH SAID ROOF, SAID PIPES BEING AFFIXED TO THE UPPER PORTION AND COMMUNICATING WITH THE HEAT EXHANNGER, WHEREBY A HEATED FLUID MAY BE CIRCULATED THROUGH THE PIPES AND HEAT EXCHANGER; AND GAS DISCHARGE MEANS AFFIXED TO SAID PART AND EXTENDING DOWN WITHIN SAID TUBE TO CIRCULATE THE DIGESTER LIQUID UPWARDLY THROUGH THE TUBE.
Claim 2
Dependent Claim
166 words
IN A DIGESTER HAVING A FLOATING ROOF WITH A GIVEN RANGE OF VERTICAL TRAVEL, AND A BASE, THE IMPROVEMENT COMPRISING: A VERTICAL UPDRAFT TUBE HAVING TELESCOPING UPPER AND LOWER PORTIONS, SAID LOWER PORTION BEING STATIONARY AND BEING MOUNTED ON SAID BASE IN THE CENTRAL PORTION THEREOF, SAID PORTIONS BEING FREE TO TELESCOPE A DISTANCE AT LEAST APPROXIMATELY EQUAL TO THE AMOUNT OF ROOF TRAVEL, THE END OF THE OUTER PORTION, WHICH END IS ADJACENT THE INNER PORTION, BEING FLARED OUTWARDLY, THE UPPER PORTION INCLUDING A DOUBLE-WALLED, ANNULAR HEAT EXCHANGER; SAID ROOF HAVING A CENTRAL PART MOUNTED ON AND REMOVABLE FROM THE REMAINDER OF THE ROOF; A PAIR OF PIPES AFFIXED TO AND EXTENDING THROUGH SAID ROOF, SAID PIPES BEING AFFIXED TO THE UPPER PORTION AND COMMUNICATING WITH THE HEAT EXHANNGER, WHEREBY A HEATED FLUID MAY BE CIRCULATED THROUGH THE PIPES AND HEAT EXCHANGER; AND GAS DISCHARGE MEANS AFFIXED TO SAID PART AND EXTENDING DOWN WITHIN SAID TUBE TO CIRCULATE THE DIGESTER LIQUID UPWARDLY THROUGH THE TUBE.
References Cited (Backward Citations)
US1912595A
Cited
US3055502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |