US2991878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heavy media separation of porous material
Assignee: Minerals and Chemicals Philipp Corp
•
Filing: 1957-08-07
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Granted: 1961-07-11
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Expires: 1977-08-07
Abstract
No abstract record available.
Inventors
- 👤 Wright W Gary
- 👤 James B Duke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:47
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/009; B01J21/00; B01J21/20; B01J38/00; B01J38/72; B03; B03B; B03B1/00; B03B5/00; B03B5/28; B03B5/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
55 words
THE PROCESS FOR PREVENTING ADHESION OF THE COMMINUTED SOLIDS COMPONENT OF A HEAVY MEDIA TO POROUS GRANULAR SOLIDS TREATED IN SAID HEAVY MEDIA WHICH COMPRISES FILLING THE PORES OF SAID GRANULAR MATERIAL WITH A NON-VISCOUS LIQUID SUBSTANTIALLY IMMISCIBLE WITH AND HAVING A SPECIFIC GRAVITY LESS THAN THAT OF THE LIQUID COMPONENT OF SAID HEAVY MEDIA.
References Cited (Backward Citations)
US2631968A
Cited
US1895504A
Cited
US2643215A
Cited
US2483372A
Cited
US2699256A
Cited
US2832470A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |