US3915725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing hollow spherical aggregates of xonotlite
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1973-11-27
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Granted: 1975-10-28
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Expires: 1993-11-27
Abstract
Abstract Spherical aggregates each having ribbon-shaped crystals of xonotlite intertwined is produced by hydrothermally reacting a slurry of silicic acid, and lime and spraying the resultant suspension under conditions of high temperature and pressure. A shaped article are produced by mixing the said spherical aggregates with a biding agent, shaping the resultant mixture to form, pressurizing the shaped mixture and drying the compressed shaped mixture.
Inventors
- 👤 Akira Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:58
CPC Classifications
C; C04; C04B; C04B18/00; C04B18/02; C04B18/021; C01; C01B; C01B33/00; C01B33/20; C01B33/22; C01B33/24; C04B14/00; C04B14/02; C04B14/04; C04B14/043; C04B18/027; C04B28/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
143 words
A PROCESS FOR PRODUCING A SHAPED ARTICLE, COMPRISING THE STEPS OF: 1 PRODUCING SPHERICAL AGGREGATES EACH HAVING RIBBONSHAPED CRYSTALS OF XONOTLITE INTERWINED AS A HOLLOW SPHERE MEASURING FROM 10 U TO 200 U IN OUTSIDE DIAMETER AND HAVING A SPARSE INNER TEXTURE AND A LOW BULK DENSITY BY: A. MIXING SILICIC ACID, LIME AND WATER IN AMOUNS TO GIVE A SILICIC AND/LIME MOLAR RATIO BETWEEN 0.8 AND 1.1 AND FORMING A SLURRY THEREOF, B. PLACING THE RESULTANT SLURRY IN AN AUTOCLAVE AND PRESSURIZING SAID SLURRY WITH SATURATED STREAM AT 200*C,250*C, AND THEREBY PRODUCING A SUSPENSION CONTAINING CHIEFLY RIBBON-SHAPED XONOTITE CRYSTALS HAVING A LENGTH OF 10U TO 25U A WIDTH OF 0.05 TO 0.3U, A THICKNESS OF 0.01 TO 0.1U AND A LONG-SHORT RATIO EXCEEDING 100, C. DEPRIVING THE SUSPENSION OF PRESSURE BY SPRAY DRYING THE SUSPENSION AT HE HEIGHT TEMPERATURE FROM THE AUTOCLOVE,
Claim 2
Dependent Claim
143 words
A PROCESS FOR PRODUCING A SHAPED ARTICLE, COMPRISING THE STEPS OF: 1 PRODUCING SPHERICAL AGGREGATES EACH HAVING RIBBONSHAPED CRYSTALS OF XONOTLITE INTERWINED AS A HOLLOW SPHERE MEASURING FROM 10 U TO 200 U IN OUTSIDE DIAMETER AND HAVING A SPARSE INNER TEXTURE AND A LOW BULK DENSITY BY: A. MIXING SILICIC ACID, LIME AND WATER IN AMOUNS TO GIVE A SILICIC AND/LIME MOLAR RATIO BETWEEN 0.8 AND 1.1 AND FORMING A SLURRY THEREOF, B. PLACING THE RESULTANT SLURRY IN AN AUTOCLAVE AND PRESSURIZING SAID SLURRY WITH SATURATED STREAM AT 200*C,250*C, AND THEREBY PRODUCING A SUSPENSION CONTAINING CHIEFLY RIBBON-SHAPED XONOTITE CRYSTALS HAVING A LENGTH OF 10U TO 25U A WIDTH OF 0.05 TO 0.3U, A THICKNESS OF 0.01 TO 0.1U AND A LONG-SHORT RATIO EXCEEDING 100, C. DEPRIVING THE SUSPENSION OF PRESSURE BY SPRAY DRYING THE SUSPENSION AT HE HEIGHT TEMPERATURE FROM THE AUTOCLOVE,
Claim 3
Dependent Claim
29 words
MIXING RECOVERED SPHERICAL AGGREGATES FROM STEP (C) WITH A SMALL AMOUNT OF AT LEAST ONE BINDING SELECTED FROM THE GROUP CONDISTING OF BENTONITE, COLLODAL SILICA AND CEMENT AND WATER,
Claim 4
Dependent Claim
29 words
MIXING RECOVERED SPHERICAL AGGREGATES FROM STEP (C) WITH A SMALL AMOUNT OF AT LEAST ONE BINDING SELECTED FROM THE GROUP CONDISTING OF BENTONITE, COLLODAL SILICA AND CEMENT AND WATER,
Claim 5
Dependent Claim
30 words
mixing recovered spherical aggregates from Step (c) with a small amount of at least one binding agent selected from the group consisting of bentonite, colloidal silica and cement and water;
Claim 6
Dependent Claim
30 words
mixing recovered spherical aggregates from Step (c) with a small amount of at least one binding agent selected from the group consisting of bentonite, colloidal silica and cement and water;
Claim 7
Dependent Claim
41 words
The process of claim 1, wherein at least one member selected from the group consisting of glass wool, asbestos and slag wool is added as a reinforcing agent in the form of inorganic fibers to said spherical aggregates of Step (2).
Claim 8
Dependent Claim
11 words
molding the resultant mixture of Step (2) to a molded shape;
Claim 9
Dependent Claim
11 words
molding the resultant mixture of Step (2) to a molded shape;
Claim 10
Dependent Claim
11 words
MOLDING THE RESULTANT MIXTURE OF STEP (2) TO A MOLDED SHAPE,
Claim 11
Dependent Claim
11 words
MOLDING THE RESULTANT MIXTURE OF STEP (2) TO A MOLDED SHAPE,
Claim 12
Dependent Claim
10 words
PRESURRING THE MOLDED MIXTURE OF AGGREGATES OF STEP (3), AND
Claim 13
Dependent Claim
10 words
PRESURRING THE MOLDED MIXTURE OF AGGREGATES OF STEP (3), AND
Claim 14
Dependent Claim
10 words
pressuring the molded mixture of aggregates of Step (3); and
Claim 15
Dependent Claim
10 words
pressuring the molded mixture of aggregates of Step (3); and
Claim 16
Dependent Claim
5 words
drying the pressurized shape mixture.
Claim 17
Dependent Claim
5 words
drying the pressurized shape mixture.
Claim 18
Dependent Claim
5 words
DRYING THE PRESSURIZED SHAPE MIXTURE.
Claim 19
Dependent Claim
5 words
DRYING THE PRESSURIZED SHAPE MIXTURE.
References Cited (Backward Citations)
US3501324A
Cited
US3679446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |