Patent US2644790A successfully refreshed from Google Patents.
US2644790A
Expired / Lapsed
US
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Apparatus for handling sludge
Assignee: Individual
•
Filing: 1949-12-07
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Granted: 1953-07-07
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Expires: 1969-12-07
Abstract
No abstract record available.
Inventors
- 👤 Charles S Harper
- 👤 Frank N Moerk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:55
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/12; C02F11/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
IN AN APPARATUS FOR DRYING DIGESTED SEWAGE SLUGE, A SUB-FLOOR MARGINALLY ENCLOSED BY UPSTANTING WALLS, A WATER-PERVIOUS BED FOR SUPPORTING A DEPOSIT OF SLUDGE IN A HORIZONAL PLANE SPACED VERTICALLY ABOVE SAID SUB-FLOOR, SAID BED BEING ALSO ENCLOSED BY SAID WALLS TO PROVIDE A MARGINALLY ENCLOSED CHAMBER BETWEEN SAID BED AND SUB-FLOOR, MEANS FOR DRAINING FROM SAID CHAMBER THE SLUDGE WATER FILTERED THROUGH THE SLUDGE-SUPPORTING BED, AND MEANS FOR CIRCULATING HEATED AIR THROUGH SAID CHAMBER TO DRY SAID SLUDGE DEPOSIT UPWARDLY FROM ITS BOTTOM SURFACE, SAID LAST-MENTIONED MEANS INCLUDING AN AIR BLOWER AND A CONDUIT SYSTEM FOR INTRODUCING AIR INTO ONE SIDE OF SAID CHAMBER AT POINT SPACED ALONG THE LENGTH THEREOF.
Claim 2
Dependent Claim
112 words
IN AN APPARATUS FOR DRYING DIGESTED SEWAGE SLUGE, A SUB-FLOOR MARGINALLY ENCLOSED BY UPSTANTING WALLS, A WATER-PERVIOUS BED FOR SUPPORTING A DEPOSIT OF SLUDGE IN A HORIZONAL PLANE SPACED VERTICALLY ABOVE SAID SUB-FLOOR, SAID BED BEING ALSO ENCLOSED BY SAID WALLS TO PROVIDE A MARGINALLY ENCLOSED CHAMBER BETWEEN SAID BED AND SUB-FLOOR, MEANS FOR DRAINING FROM SAID CHAMBER THE SLUDGE WATER FILTERED THROUGH THE SLUDGE-SUPPORTING BED, AND MEANS FOR CIRCULATING HEATED AIR THROUGH SAID CHAMBER TO DRY SAID SLUDGE DEPOSIT UPWARDLY FROM ITS BOTTOM SURFACE, SAID LAST-MENTIONED MEANS INCLUDING AN AIR BLOWER AND A CONDUIT SYSTEM FOR INTRODUCING AIR INTO ONE SIDE OF SAID CHAMBER AT POINT SPACED ALONG THE LENGTH THEREOF.
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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) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |