Patent US2538412A successfully refreshed from Google Patents.
US2538412A
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Sludge heater
Assignee: Infilco Inc
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Filing: 1945-12-29
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Granted: 1951-01-16
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Expires: 1965-12-29
Abstract
No abstract record available.
Inventors
- 👤 Lawrence K Cecil
- 👤 Herbert W Gillard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:46
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/28; C02F3/2866; C02F3/2873; C02F11/00; C02F11/18; C12; C12M; C12M21/00; C12M21/04; C12M23/00; C12M23/36; C12M27/00; C12M27/18; C12M27/24; C12M41/00; C12M41/12; C12M41/18; C12M41/24; Y; Y10; Y10S; Y10S210/00; Y10S210/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A METHOD OF HEATING SLUDGE UNDERGOING DIGESTION TO MAINTAIN A TEMPERATURE FAVORABLE FOR DIGESTION, WHICH COMPRISES BURNING COMBUSTIBLE MATERIAL UNDER PRESSURE AND DISCHARGING THE HOT GASES OF COMBUSTION RESULTING FROM SUCH BURNING WITHIN A SUBMERGED LAYER OF DIGESTING SLUDGE, THEREBY HEATING SAID SLUDGE BY DIRECT HEAT TRANSFER AND CAUSING A CIRCULATION WITHIN THE SLUDGE, AND SEPARATING THE GASES OF COMBUSTION FROM THE DIGESTING SLUDGE AND WITHDRAWING THEM TO WASTE SEPARATELY FROM THE COMBUSTIBLE DIGESTER GASES.
Claim 2
Independent Claim
75 words
A METHOD OF HEATING SLUDGE UNDERGOING DIGESTION TO MAINTAIN A TEMPERATURE FAVORABLE FOR DIGESTION, WHICH COMPRISES BURNING COMBUSTIBLE MATERIAL UNDER PRESSURE AND DISCHARGING THE HOT GASES OF COMBUSTION RESULTING FROM SUCH BURNING WITHIN A SUBMERGED LAYER OF DIGESTING SLUDGE, THEREBY HEATING SAID SLUDGE BY DIRECT HEAT TRANSFER AND CAUSING A CIRCULATION WITHIN THE SLUDGE, AND SEPARATING THE GASES OF COMBUSTION FROM THE DIGESTING SLUDGE AND WITHDRAWING THEM TO WASTE SEPARATELY FROM THE COMBUSTIBLE DIGESTER GASES.
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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) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |