US3800032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Active magnesium oxide
Assignee: K+S AG
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Filing: 1971-11-09
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Granted: 1974-03-26
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Expires: 1991-11-09
Abstract
Abstract A process for the preparation of active magnesium oxide having a large specific area by dispersing magnesium hydroxide or oxide with water forming a turbid liquid having a turbidity density of about 5 to 20 percent and vigorously agitating the liquid for about 5 to 60 minutes, the temperature of the turbid liquid being kept at about 80* to 110* C throughout the process, by introducing steam, washing the filter cake, drying and calcining the separated magnesium compound to obtain large surface area magnesium oxide.
Inventors
- 👤 H Eberle
- 👤 W Meyer
- 👤 H Bartling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:07
CPC Classifications
C; C01; C01F; C01F5/00; C01F5/02; C01F5/14; C01P; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
25 words
A process according to claim 1 in which thE magnesium oxide or hydroxide is dispersed in water by mashing said oxide or hydroxide with water.
Claim 2
Dependent Claim
17 words
A process according to claim 2 in which the turbidity density is about 10 to 15 percent.
Claim 3
Dependent Claim
20 words
A process according to claim 3 in which the agitation is for a period of about 10 to 30 minutes.
Claim 4
Dependent Claim
20 words
A process according to claim 4 in which the temperature during agitation is maintained at about 85* to 95* C.
Claim 5
Dependent Claim
29 words
A process according to claim 1 in which the magnesium oxide or hydroxide is washed with water at a temperature of about 80* to 100*C during separation (step c).
Claim 6
Dependent Claim
19 words
A process according to claim 1, in which the active magnesium oxide has an iodine value of about 136-192.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |