US2713420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clarification process
Assignee: Southwestern Engineering Co
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Filing: 1954-05-18
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Granted: 1955-07-19
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Expires: 1974-05-18
Abstract
No abstract record available.
Inventors
- 👤 Lord Joseph Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:01
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A PROCESS FOR THE CLARIFICATION OF AN AQUEOUS SLURRY CONTAINING SUSPENDED POWDERED HIGH-ASH SOLIDS DERIVED FROM COAL WHICH COMPRISES ADMIXING A MATERIAL SELECTED FROM THE GROUP CONSISTING OF SAPONIFIABLE ACIDS AND THEIR SOAPS AND A FROTHING MIXTURE CONTAINING A WATER-INSOLUBLE HYDROCARBON OIL WITH SAID SLURRY, PASSING AIR THROUGH THE ADMIXTURE TO PRODUCE A FROTH OVERFLOW CONTAINING SAID SUSPENDED POWDERED HIGH-ASH SOLIDS, AND REMOVING THE FROTH OVERFLOW WHEREBY THE REMAINING WATER IS SUBSTANTIALLY CLARIFIED OF SAID SUSPENDED POWDERED HIGH-ASH SOLIDS.
Claim 2
Dependent Claim
79 words
A PROCESS FOR THE CLARIFICATION OF AN AQUEOUS SLURRY CONTAINING SUSPENDED POWDERED HIGH-ASH SOLIDS DERIVED FROM COAL WHICH COMPRISES ADMIXING A MATERIAL SELECTED FROM THE GROUP CONSISTING OF SAPONIFIABLE ACIDS AND THEIR SOAPS AND A FROTHING MIXTURE CONTAINING A WATER-INSOLUBLE HYDROCARBON OIL WITH SAID SLURRY, PASSING AIR THROUGH THE ADMIXTURE TO PRODUCE A FROTH OVERFLOW CONTAINING SAID SUSPENDED POWDERED HIGH-ASH SOLIDS, AND REMOVING THE FROTH OVERFLOW WHEREBY THE REMAINING WATER IS SUBSTANTIALLY CLARIFIED OF SAID SUSPENDED POWDERED HIGH-ASH SOLIDS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-18 | 1959-01-17 | 1959-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-18 | 1963-01-17 | 1963-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-18 | 1967-01-17 | 1967-07-19 | $7700.00 | Window Closed / Lapsed |