Patent US2500727A successfully refreshed from Google Patents.
US2500727A
Expired / Lapsed
US
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Treatment and purification of clay
Assignee: Georgia Kaolin Co
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Filing: 1949-08-06
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Granted: 1950-03-14
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Expires: 1969-08-06
Abstract
No abstract record available.
Inventors
- 👤 Whittaker Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:48
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/04; C04B33/06; C04B33/30; C09; C09C; C09C1/00; C09C1/40; C09C1/42; C01; C01P; C01P2006/00; C01P2006/40; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
THE PROCESS OF TREATING CLAY AND LIKE MATERIALS CONTAINING CONTAMINATING SOLUBLE SALTS, WHICH COMPRISES CONTACTING AN AQUEOUS SUSPENSION OF CLAY WITH AN ANION EXCHANGER IN ITS OH FORM AND WITH A CATION EXCHANGER IN ITS HYDROGEN FORM, AND SEPARATING SAID EXCHANGERS FROM THE CLAY SUSPENSIONS.
Claim 2
Dependent Claim
45 words
THE PROCESS OF TREATING CLAY AND LIKE MATERIALS CONTAINING CONTAMINATING SOLUBLE SALTS, WHICH COMPRISES CONTACTING AN AQUEOUS SUSPENSION OF CLAY WITH AN ANION EXCHANGER IN ITS OH FORM AND WITH A CATION EXCHANGER IN ITS HYDROGEN FORM, AND SEPARATING SAID EXCHANGERS FROM THE CLAY SUSPENSIONS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |