US3753753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating clay to impove optical properties
Assignee: Dow Chemical Co
•
Filing: 1971-02-12
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Granted: 1973-08-21
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Expires: 1991-02-12
Abstract
Abstract A method of improving the optical properties of clay which comprises forming an aqueous mixture of clay with magnesium oxide, and aging the mixture.
Inventors
- 👤 D Kirby
- 👤 R Kroening
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:51
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/40; C09C1/42; D; D21; D21H; D21H19/00; D21H19/36; D21H19/38; D21H19/40; C01; C01P; C01P2006/00; C01P2006/12; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
24 words
The method of claim 1 wherein the mixture is aged for a time within the range of from about 1 to about 24 hours.
Claim 2
Dependent Claim
23 words
The method of claim 1 wherein the mixture is aged at a temperature within the range of from about 40*C to about 180C.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the magnesium oxide is admixed in an amount of from about 1 to about 2 weight per cent.
Claim 4
Dependent Claim
13 words
Aged kaolin with improved optical properties produced by the method of claim 1.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |