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US4523955A
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US
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Hydrous calcium silicate insulation products manufactured by recycling greenware
Assignee: Owens Corning Fiberglas Technology Inc
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Filing: 1984-05-02
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Granted: 1985-06-18
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Expires: 2004-05-02
Abstract
Abstract Off-size greenware (the product resulting from the initial gelation and filter pressing of calcareous and siliceous materials in an aqueous slurry) is recycled. The greenware is pulverized into a desirable size and combined with new calcareous and siliceous materials in the initial slurrying step. The slurry containing recycled greenware gels at an improved rate.
Inventors
- 👤 Jerry L. Helser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:57
CPC Classifications
C; C04; C04B; C04B18/00; C04B18/04; C04B18/16; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
135 words
A moldable slurry for manufacturing low density hydrated calcium silicate heat insulating bodies comprising an aqueous slurry of reactive calcareous and siliceous materials and particulated greenware, and produced by a process including the steps of: a. preparing a moldable slurry comprising a water dispersion of reactive calcareous and siliceous containing materials; b. partially gelling said dispersion by heating at a temperature of approximately 180°-210° F.; c. molding said partially gelled dispersion and expressing water therefrom thereby forming rigid greenware articles; d. removing portions of said greenware articles selected for recycling to the process; e. curing the remaining molded articles by heating and pressurizing; and f. pulverizing the selected greenware articles from step d to form particulated greenware and adding said particulated greenware to the composition of step a in a subsequent cycle of the process.
Claim 2
Dependent Claim
135 words
A moldable slurry for manufacturing low density hydrated calcium silicate heat insulating bodies comprising an aqueous slurry of reactive calcareous and siliceous materials and particulated greenware, and produced by a process including the steps of: a. preparing a moldable slurry comprising a water dispersion of reactive calcareous and siliceous containing materials; b. partially gelling said dispersion by heating at a temperature of approximately 180°-210° F.; c. molding said partially gelled dispersion and expressing water therefrom thereby forming rigid greenware articles; d. removing portions of said greenware articles selected for recycling to the process; e. curing the remaining molded articles by heating and pressurizing; and f. pulverizing the selected greenware articles from step d to form particulated greenware and adding said particulated greenware to the composition of step a in a subsequent cycle of the process.
Claim 3
Dependent Claim
25 words
The slurry of claim 1 wherein said particulated greenware is present in an amount of between 10 and 30 percent by weight of dry solids.
References Cited (Backward Citations)
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Cited
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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) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |