US2956016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mineral filter aid composition
Assignee: GREAT LAKES CARBON Corp
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Filing: 1959-05-06
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Granted: 1960-10-11
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Expires: 1979-05-06
Abstract
No abstract record available.
Inventors
- 👤 Paul W Leppla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:33
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A FILLER AID HAVING A FILTER CAKE DENSITY OF BETWEEN ABOUT 4 TO 18 LBS. PER CUBIC FOOT COMPRISING ESSENTIALLY A MIXTURE OF FROM ABOUT 50 TO 20 PERCENT BY WEIGHT OF DIATOMACEOUS EARTH FILTER AID, AND FROM ABOUT 50 TO 80 PERCENT BY WEIGHT OF EXPANDED PERLITE AGGREGATE HAVING AN APPARENT BULK DENSITY OF BETWEEN ABOUT 1 TO 6 LBS. PER CUBIC FOOT AND A PARTICLE SIZE DISTRIBUTION RANGING BETWEEN ABOUT 20 TO 200 MESH, NOT MORE THAN ABOUT 20 PERCENT BY VOLUME OF SAID EXPANDED PERLITE PARTICLES HAVING THE PROPERTY OF SUBSIDING IN WATER.
Claim 2
Dependent Claim
96 words
A FILLER AID HAVING A FILTER CAKE DENSITY OF BETWEEN ABOUT 4 TO 18 LBS. PER CUBIC FOOT COMPRISING ESSENTIALLY A MIXTURE OF FROM ABOUT 50 TO 20 PERCENT BY WEIGHT OF DIATOMACEOUS EARTH FILTER AID, AND FROM ABOUT 50 TO 80 PERCENT BY WEIGHT OF EXPANDED PERLITE AGGREGATE HAVING AN APPARENT BULK DENSITY OF BETWEEN ABOUT 1 TO 6 LBS. PER CUBIC FOOT AND A PARTICLE SIZE DISTRIBUTION RANGING BETWEEN ABOUT 20 TO 200 MESH, NOT MORE THAN ABOUT 20 PERCENT BY VOLUME OF SAID EXPANDED PERLITE PARTICLES HAVING THE PROPERTY OF SUBSIDING IN WATER.
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) | 1963-10-11 | 1964-04-11 | 1964-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-11 | 1968-04-11 | 1968-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-11 | 1972-04-11 | 1972-10-11 | $7700.00 | Window Closed / Lapsed |