US3021282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heavy medium for gravity separations
Assignee: P-M Associates
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Filing: 1958-09-04
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Granted: 1962-02-13
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Expires: 1978-09-04
Abstract
No abstract record available.
Inventors
- 👤 Everett L Joppa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:40
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/28; B03B5/30; B03B5/44; B03B5/442
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A HEAVY MEDIUM FOR USE IN THE GRAVITY SEPARATION OFA MIXTURE OF SOLID MINERAL PARTICLES OF DIFFERENT SPECIFIC GRAVITIES, SAID HEAVY MEDIUM CONSISTING ESSENTIALLY OF AN AQUEOUS LIQUID SUSPENSION OF A MAGNETIC FRACTION OF FLY ASH COMPOSED OF GENERALLY SPHERICAL PARTICLES CONSISTING ESSENTIALLY OF MAGNETITE AND OF VARYING SIZES ALL OF WHICH ARE FINER THAN 35 MESH AND THE GREATER PART OF WHICH ARE FINER THAN MINUS 325 MESH PARTICLES, THE PARTICLES OF SAID MAGNETIC FRACTION ASSAYING MORE THAN 53% BY WEIGHT OF IRON MOSTLY AS MAGNETITE AND LESS THAN 16% BY WEIGHT OF OF SILICA, SAID HEAVY MEDIUM HAVINGA SPECIFIC GRAVITY WITHIN THE RANGE 1.45 AND 2.45.
Claim 2
Dependent Claim
108 words
A HEAVY MEDIUM FOR USE IN THE GRAVITY SEPARATION OFA MIXTURE OF SOLID MINERAL PARTICLES OF DIFFERENT SPECIFIC GRAVITIES, SAID HEAVY MEDIUM CONSISTING ESSENTIALLY OF AN AQUEOUS LIQUID SUSPENSION OF A MAGNETIC FRACTION OF FLY ASH COMPOSED OF GENERALLY SPHERICAL PARTICLES CONSISTING ESSENTIALLY OF MAGNETITE AND OF VARYING SIZES ALL OF WHICH ARE FINER THAN 35 MESH AND THE GREATER PART OF WHICH ARE FINER THAN MINUS 325 MESH PARTICLES, THE PARTICLES OF SAID MAGNETIC FRACTION ASSAYING MORE THAN 53% BY WEIGHT OF IRON MOSTLY AS MAGNETITE AND LESS THAN 16% BY WEIGHT OF OF SILICA, SAID HEAVY MEDIUM HAVINGA SPECIFIC GRAVITY WITHIN THE RANGE 1.45 AND 2.45.
References Cited (Backward Citations)
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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) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |