US5134103A
Expired / Lapsed
US
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Process for making magnesium oxide spheres
Assignee: Phillips Petroleum Co
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Filing: 1991-02-04
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Granted: 1992-07-28
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Expires: 2011-02-04
Abstract
Abstract A method to prepare spherical particles comprising magnesium oxide and magnesium hydroxide, wherein said magnesium hydroxide acts as a binder and no extraneous binder is present.
Inventors
- 👤 Richard E. Lowery
- 👤 James L. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:02
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/10; B01J35/00; B01J35/50; B01J35/51; C; C07; C07C; C07C5/00; C07C5/22; C07C5/23; C07C5/25; C07C5/2506; C07C5/2512; C07C2521/00; C07C2521/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
A process for making spherical particles consisting essentially of the following steps in the order named: (a) placing water and magnesium oxide on a rotating disk; (b) rotating said disk to form spherical particles; (c) drying said particles; and (d) calcining said dried particles at a time and temperature sufficient to form spherical particles consisting essentially of magnesium oxide and magnesium hydroxide, wherein no extraneous binder is present.
Claim 2
Dependent Claim
68 words
A process for making spherical particles consisting essentially of the following steps in the order named: (a) placing water and magnesium oxide on a rotating disk; (b) rotating said disk to form spherical particles; (c) drying said particles; and (d) calcining said dried particles at a time and temperature sufficient to form spherical particles consisting essentially of magnesium oxide and magnesium hydroxide, wherein no extraneous binder is present.
Claim 3
Dependent Claim
80 words
A process according to claim 1 wherein in step (a) said water and said magnesium oxide are present in a ratio from about 0.5 to about 0.75 kg. of water/kg. of magnesium oxide; in step (c) said drying occurs at a temperature from about 135° C. to about 315° C. for a period of about 15 seconds to about 8 hours; and in step (d) said calcining temperature is within the range from about 425° C. to about 590° C.
Claim 4
Dependent Claim
57 words
A process according to claim 2 wherein in step (a) said water and said magnesium oxide are present in a ratio from 0.5 to 0.7 kg. of water/kg. of magnesium oxide; and in step (d) said calcining time is within the range of 0.5 to 6.0 hours at said calcining temperature of 425° C. to 450° C.
Claim 5
Dependent Claim
31 words
A process according to claim 3 wherein in step (a) said water and said magnesium oxide are present in a ratio of 0.55 to 0.65 kg. of water/kg. of magnesium oxide.
Claim 6
Dependent Claim
60 words
A process according to claim 2 wherein in step (a) said water and said magnesium oxide are present in a ratio from 0.5 to 0.7 kg. of water/kg. of magnesium; and in step (d) said calcining time is within the range of 0.5 to 2.0 hours and said calcining temperature is within the range of 451° C. to 590° C.
Claim 7
Dependent Claim
53 words
A process according to claim 5 wherein in step (a) said water and said magnesium oxide are present in a ratio from 0.55 to 0.65 kg. of water/kg. of magnesium oxide; and in step (d) said calcining time is approximately 1 hour and said calcining temperature is within the range of 535° C.±5.
References Cited (Backward Citations)
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US3326636A
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US3748282A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-28 | 1996-01-27 | 1996-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-28 | 2000-01-27 | 2000-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-28 | 2004-01-27 | 2004-07-28 | $7700.00 | Window Closed / Lapsed |