Patent US2771284A successfully refreshed from Google Patents.
US2771284A
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Process for removal of deposits from sulfur mining pipes using hot caustic soda solution
Assignee: Freeport Minerals Co
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Filing: 1953-04-06
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Granted: 1956-11-20
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Expires: 1973-04-06
Abstract
No abstract record available.
Inventors
- 👤 Jr John E Monroe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:25
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/528; C09K8/532
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN CONNECTION WITH THE MINING OF SULFUR BY THE FRASCH PROCESS USING A CONCENTRIC PIPE SYSTEM, A PROCESS FOR REMOVING OBSTRUCTIVE DEPOSITS ACCUMULATED WITHIN THE SULFUR CONVEYING PIPE, CONTAINING CARBON-SULFUR COMPLEXES AND INORGANIC MATERIAL WHICH COMPRISES FLOWING HOT CAUSTIC SODA SOLUTION DOWN INTO SAID PIPE, SUBJECTING THE DEPOSIT TO THE ACTION OF SAID HOT CAUSTIC SODE SOLUTION UNTIL SUCH REMOVAL HAS OCCURRED AND DURING SUCH ACTION HEATING THE PIPES ON WHICH THE DEPOSIT OCCURS BY FLOWING HOT WATER DOWN THE SURROUNDING WATER CONVEYING PIPE AND FLOWING THE USED CAUSTIC SOLUTION TOGETHER WITH THE REMOVED DEPOSIT FROM THE PIPE UP TO THE SURFACE BY MEANS OF WATER AND OF COMPRESSED AIR INTRODUCED THROUGH AN AIR PIPE DOWN INTO SAID PIPE CONTAINING THE REMOVED DEPOSIT.
Claim 2
Dependent Claim
123 words
IN CONNECTION WITH THE MINING OF SULFUR BY THE FRASCH PROCESS USING A CONCENTRIC PIPE SYSTEM, A PROCESS FOR REMOVING OBSTRUCTIVE DEPOSITS ACCUMULATED WITHIN THE SULFUR CONVEYING PIPE, CONTAINING CARBON-SULFUR COMPLEXES AND INORGANIC MATERIAL WHICH COMPRISES FLOWING HOT CAUSTIC SODA SOLUTION DOWN INTO SAID PIPE, SUBJECTING THE DEPOSIT TO THE ACTION OF SAID HOT CAUSTIC SODE SOLUTION UNTIL SUCH REMOVAL HAS OCCURRED AND DURING SUCH ACTION HEATING THE PIPES ON WHICH THE DEPOSIT OCCURS BY FLOWING HOT WATER DOWN THE SURROUNDING WATER CONVEYING PIPE AND FLOWING THE USED CAUSTIC SOLUTION TOGETHER WITH THE REMOVED DEPOSIT FROM THE PIPE UP TO THE SURFACE BY MEANS OF WATER AND OF COMPRESSED AIR INTRODUCED THROUGH AN AIR PIPE DOWN INTO SAID PIPE CONTAINING THE REMOVED DEPOSIT.
References Cited (Backward Citations)
US1049054A
Cited
US1382337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |