Patent US3619422A successfully refreshed from Google Patents.
US3619422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of drying sewage sludge
Assignee: Von Roll AG
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Filing: 1968-08-30
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Granted: 1971-11-09
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Expires: 1988-08-30
Abstract
Abstract A novel process is disclosed for the transfer of heat and/or matter between two or more gaseous or liquid agents, the process utilizing a carrier substance continuously circulated in closed cycle successively through at least two working spaces wherein heat and/or mater is respectively taken up and yielded. The carrier substance is present in a thin layer and the agents are caused to flow across the layer of carrier substance at both working spaces. Novel mechanical assemblies for the performance of said process are also disclosed herein.
Inventors
- 👤 Roman Rummel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:27
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01D; B01D46/00; B01D46/30; B01D46/32; C; C02; C02F; C02F11/00; C02F11/12; C02F11/13; F; F28; F28C; F28C3/00; F28C3/10; F28C3/12; F28C3/14; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/916
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
19 words
A process as defined in claim 1, wherein the dried sludge is separated from the carrier substance by sieving.
Claim 2
Dependent Claim
27 words
A process as defined in claim 1 including the step of altering the path of movement of the sewage sludge during its travel through the working space.
Claim 3
Dependent Claim
54 words
A process as defined in claim 1, wherein a revolving cylinder is provided as the lower working space, the liquid sewage sludge being sprayed on the hot carrier substance thereat, and wherein crusts of dried sludge adhering to the metallic balls comprising the carrier substance are peeled off during tumbling in the revolving cylinder.
References Cited (Backward Citations)
US3272335A
Cited
US1614387A
Cited
US2723954A
Cited
US3290790A
Cited
US3319587A
Cited
US3306236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |