US2587639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary kiln for the recovery of acid values
Assignee: L SONNEBORN SONS Inc
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Filing: 1947-08-12
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Granted: 1952-03-04
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Expires: 1967-08-12
Abstract
No abstract record available.
Inventors
- 👤 Miley Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:32
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
IN A ROTARY KILN OF THE HORIZONTALLY DISPOSED TYPE FOR THE RECOVERY OF ACID VALUES FROM SULFURIC ACID SLUDGES AND HAVING A ROTATABLE KILN SHELL, A GAS TAKE-OFF FROM AND SLUDGE FEED INTO SAID SHELL, THE IMPROVEMENT WHICH COMPRISES A SUBSTANTIALLY HOLLOW ROLLER SUBSTANTIALLY LOOSELY POSITIONED WITHIN SAID SHELL, A HELIX PROVIDED ON THE CIRCUMFERENCE OF SAID ROLLER, SAID ROLLER RESTING WITH SAID HELIX ON THE INNER SURFACE OF SAID SHELL AND BEING SUBSTANTIALLY CONFINED AGAINST APPRECIABLE LONGITUDINAL MOVEMENT AND THE INTERIOR OF SAID ROLLER BEING SUBSTANTIALLY CLOSED AGAINST THE INTERIOR OF
Claim 2
Dependent Claim
92 words
IN A ROTARY KILN OF THE HORIZONTALLY DISPOSED TYPE FOR THE RECOVERY OF ACID VALUES FROM SULFURIC ACID SLUDGES AND HAVING A ROTATABLE KILN SHELL, A GAS TAKE-OFF FROM AND SLUDGE FEED INTO SAID SHELL, THE IMPROVEMENT WHICH COMPRISES A SUBSTANTIALLY HOLLOW ROLLER SUBSTANTIALLY LOOSELY POSITIONED WITHIN SAID SHELL, A HELIX PROVIDED ON THE CIRCUMFERENCE OF SAID ROLLER, SAID ROLLER RESTING WITH SAID HELIX ON THE INNER SURFACE OF SAID SHELL AND BEING SUBSTANTIALLY CONFINED AGAINST APPRECIABLE LONGITUDINAL MOVEMENT AND THE INTERIOR OF SAID ROLLER BEING SUBSTANTIALLY CLOSED AGAINST THE INTERIOR OF
References Cited (Backward Citations)
US1717786A
Cited
US2422989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-04 | 1955-09-03 | 1956-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-04 | 1959-09-03 | 1960-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-04 | 1963-09-03 | 1964-03-04 | $7700.00 | Window Closed / Lapsed |