Patent US2690261A successfully refreshed from Google Patents.
US2690261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration of minerals
Assignee: Western Machinery Co
•
Filing: 1951-03-02
•
Granted: 1954-09-28
•
Expires: 1971-03-02
Abstract
No abstract record available.
Inventors
- 👤 Ernest J Maust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:40
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/28; B03B5/30; B03B5/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN THE CONCENTRATION OF MINERAL PARTICLES OF DIFFERENCE SPECIFIC GRAVITIES BY THE HEAVY MEDIA SEPARATION PROCESS IN WHICH THE MINERAL PARTICLES ARE SUBJECTED TO WET SCREENING PREPARATORY TO THE SEPARATION STEP AND THE FLOAT AND SINK FRACTIONS OF THE SEPARATION STEP ARE RESPECTIVELY DRAINED AND WASHED ON A SEQUENCE OF SCREENS, THE IMPROVEMENT IN RECOVERING THE FINELY DIVIDED SOLID CONSTITUENT OF THE HEAVY MEDIUM ACCOMPANYING THE FLOAT AND SINK FRACTIONS DELIVERED TO THEIR
Claim 2
Dependent Claim
73 words
IN THE CONCENTRATION OF MINERAL PARTICLES OF DIFFERENCE SPECIFIC GRAVITIES BY THE HEAVY MEDIA SEPARATION PROCESS IN WHICH THE MINERAL PARTICLES ARE SUBJECTED TO WET SCREENING PREPARATORY TO THE SEPARATION STEP AND THE FLOAT AND SINK FRACTIONS OF THE SEPARATION STEP ARE RESPECTIVELY DRAINED AND WASHED ON A SEQUENCE OF SCREENS, THE IMPROVEMENT IN RECOVERING THE FINELY DIVIDED SOLID CONSTITUENT OF THE HEAVY MEDIUM ACCOMPANYING THE FLOAT AND SINK FRACTIONS DELIVERED TO THEIR
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) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |