Patent US4396723A successfully refreshed from Google Patents.
US4396723A
Expired / Lapsed
US
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Lightweight silicate aggregate
Assignee: LIGHTWEIGHT ENVIRONMENTAL PRODUCTS Corp A CORP OF
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Filing: 1980-02-19
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Granted: 1983-08-02
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Expires: 2000-02-19
Abstract
Abstract An improved process for the preparation of an expanded, water insoluble silicate aggregate. Anhydrous alkali metal silicate is hydrated in the presence of a curing agent, then is subjected to rapid thermal expansion. The process eliminates the use of liquid silicates, and the reaction is conducted in an essentially dry state. The expanded product has extremely low bulk density. When combined with a suitable binder and applied to various substrates, the aggregate functions as an excellent thermal barrier.
Inventors
- 👤 Ralph E. Temple
- 👤 William T. Gooding, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:33
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/10; C04B20/1051; C04B18/00; C04B18/02; C04B18/027; C04B20/02; C04B20/04; C04B20/06; C04B20/068; C04B28/00; C04B28/24; C04B28/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
81 words
A process for the preparation of a silicate aggregate, which process comprises the steps of: (a) mixing anhydrous alkali metal silicate and sufficient boron-containing curing agent to provide a boron content of about 0.5-2.5 percent in the mixture, (b) adding water to provide at least about 17 percent, by weight, of the total mixture, (c) mixing until a homogeneous, free-flowing composition is obtained, (d) curing the composition until the silicate is hydrated, while maintaining the composition in a substantially nonliquid state.
Claim 2
Dependent Claim
81 words
A process for the preparation of a silicate aggregate, which process comprises the steps of: (a) mixing anhydrous alkali metal silicate and sufficient boron-containing curing agent to provide a boron content of about 0.5-2.5 percent in the mixture, (b) adding water to provide at least about 17 percent, by weight, of the total mixture, (c) mixing until a homogeneous, free-flowing composition is obtained, (d) curing the composition until the silicate is hydrated, while maintaining the composition in a substantially nonliquid state.
Claim 3
Dependent Claim
26 words
The process of claim 1, with the additional step of: (e) comminuting the composition into discrete free-flowing particles capable of thermal expansion to a lightweight aggregate.
Claim 4
Dependent Claim
17 words
The process of claim 2, with the additional step of: (f) expanding the particles by rapid heating.
Claim 5
Dependent Claim
36 words
The process of claim 1 wherein up to about 25 percent of an insolubilizer capable of reacting with the silicate portion of the anhydrous alkali metal silicate during a subsequent expansion is added to the composition.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein the curing step is initiated by the use of heated ingredients in step (a).
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein the curing is initiated by the addition of heated water in step (b).
References Cited (Backward Citations)
US3663249A
Cited
US3765919A
Cited
US3743601A
Cited
US3728208A
Cited
US3756839A
Cited
US3719510A
Cited
US4080187A
Cited
US4131543A
Cited
US4081392A
Cited
US4203773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |