US4849195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic crystal aggregates of xonotlite and process for preparing same
Assignee: Redco NV SA
•
Filing: 1988-05-10
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Granted: 1989-07-18
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Expires: 2008-05-10
Abstract
Abstract In synthetic, substantially spherical crystal aggregates of xonotlite having a particle size of more than 20 microns, and preferably up to 150 microns, up to 30% of the silicon atoms can be replaced by titanium or zirconium atoms, and inert particles can be incorporated in the crystal aggregates.
Inventors
- 👤 Octavian Anton
- 👤 Dirk Van Wouwe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:54
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/18; C01; C01B; C01B33/00; C01B33/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
46 words
Synthetic, substantially spherical crystal aggregates of xonotlite having a particle size of at least 20 microns, characterized in that the silicon atoms have been replaced by titanium atoms, zirconium atoms, or a mixture thereof, wherein a maximum of 30? of the silicon atoms have been replaced.
Claim 2
Dependent Claim
46 words
Synthetic, substantially spherical crystal aggregates of xonotlite having a particle size of at least 20 microns, characterized in that the silicon atoms have been replaced by titanium atoms, zirconium atoms, or a mixture thereof, wherein a maximum of 30? of the silicon atoms have been replaced.
Claim 3
Dependent Claim
15 words
Crystal aggregates according to claim 1, wherein 0.1-30% of the silicon atoms have been replaced.
Claim 4
Dependent Claim
15 words
Crystal aggregates according to claim 1, wherein 1-30% of the silicon atoms have been replaced.
Claim 5
Dependent Claim
15 words
Crystal aggregates according to claim 1 having a particle size of 20 to 150 microns.
Claim 6
Dependent Claim
78 words
Process for producing synthetic, substantially spherical crystal aggregates of xonotlite having a particle size of at least 20 microns comprising the steps of (a) mixing finely divided SiO 2 , CaO, an active compound containing an element wherein the element is titanium, zirconium, or a mixture thereof, and water at a molar ratio of silicon+element:calcium of substantially 1:1, and (b) heating the mixture to a temperature between 140° C. and 230 °C. under stirring conditions within 2 hours.
Claim 7
Dependent Claim
78 words
Process for producing synthetic, substantially spherical crystal aggregates of xonotlite having a particle size of at least 20 microns comprising the steps of (a) mixing finely divided SiO 2 , CaO, an active compound containing an element wherein the element is titanium, zirconium, or a mixture thereof, and water at a molar ratio of silicon+element:calcium of substantially 1:1, and (b) heating the mixture to a temperature between 140° C. and 230 °C. under stirring conditions within 2 hours.
Claim 8
Dependent Claim
17 words
Process of claim 5 wherein the particle size of the crystal aggregates is 20 to 150 microns.
Claim 9
Dependent Claim
21 words
The process according to claim 5, wherein the active compound containing an element is a finely divided reactive oxyhydrate or oxyhalide.
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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) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |