US4128434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High density asbestos-free tobermorite thermal insulation containing wollastonite
Assignee: Johns Manville Corp
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Filing: 1977-06-23
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Granted: 1978-12-05
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Expires: 1997-06-23
Abstract
Abstract A high density thermal insulation material is described, consisting essentially of 15 to 40 parts lime, 20 to 40 parts silica or other silicious material, 15 to 40 parts wollastonite, all slurried in water, then compressed to a shape retaining body of at least 20 pcf density and indurated to form an asbestos-free, wollastonite-reinforced, tobermorite calcium silicate hydrate matrix thermal insulation.
Inventors
- 👤 Walter G. Pusch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:11
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/18; C04B28/186; C04B28/188; C04B14/00; C04B14/02; C04B14/04; C04B14/06; C04B14/08; C04B14/14; C04B14/18; C04B14/38; C04B14/42; C04B16/00; C04B16/04; C04B16/06; C04B18/00; C04B18/04; C04B18/18; C04B18/24; C04B2111/00; C04B2111/10; C04B2111/12; C04B2111/20; C04B2111/28; C04B40/00; C04B40/02; C04B40/024; Y; Y02; Y02P; Y02P40/00; Y02P40/60; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
125 words
A high density asbestos-free thermal insulation body formed by slurrying a mixture consisting essentially of, in parts by weight: 15 to 40 parts lime, 20 to 40 parts by weight of a siliceous component, and 15 to 40 parts by weight wollastonite, said mixture containing no asbestos fiber, in at least one part by weight water per part by weight of dry solids in said mixture; molding the slurry to a shape-retaining body having a density of at least 20 pcf; and thereafter curing said molded body in an atmosphere of steam at elevated pressure for a sufficient time to cause the lime, siliceous component, and water to form a calcium silicate hydrate matrix consisting essentially of tobermorite crystalline phase and reinforced by said wollastonite.
Claim 2
Dependent Claim
125 words
A high density asbestos-free thermal insulation body formed by slurrying a mixture consisting essentially of, in parts by weight: 15 to 40 parts lime, 20 to 40 parts by weight of a siliceous component, and 15 to 40 parts by weight wollastonite, said mixture containing no asbestos fiber, in at least one part by weight water per part by weight of dry solids in said mixture; molding the slurry to a shape-retaining body having a density of at least 20 pcf; and thereafter curing said molded body in an atmosphere of steam at elevated pressure for a sufficient time to cause the lime, siliceous component, and water to form a calcium silicate hydrate matrix consisting essentially of tobermorite crystalline phase and reinforced by said wollastonite.
Claim 3
Dependent Claim
23 words
A thermal insulation as in claim 1, wherein said mixture further consists essentially of up to 8 parts by weight of organic fiber.
Claim 4
Dependent Claim
23 words
A thermal insulation as in claim 1, wherein said mixture further consists essentially of up to 15 parts by weight of mineral wool.
Claim 5
Dependent Claim
22 words
A thermal insulation as in claim 1, wherein said mixture further consists essentially of up to 20 parts by weight of perlite.
Claim 6
Dependent Claim
23 words
A thermal insulation as in claim 1, wherein said mixture further consists essentially of up to 10 parts by weight of glass fiber.
Claim 7
Dependent Claim
20 words
A thermal insulation as in claim 2 wherein said organic fiber is a kraft fiber, newsprint fiber, polyester, or cotton.
Claim 8
Dependent Claim
21 words
A thermal insulation as in claim 3, wherein said mixture further comprises 3 to 10 parts by weight of mineral wool.
Claim 9
Dependent Claim
20 words
A thermal insulation as in claim 4, wherein said mixture further comprises 5 to 15 parts by weight of perlite.
Claim 10
Dependent Claim
15 words
A thermal insulation as in claim 1 having a density of at least 35 pcf.
Claim 11
Dependent Claim
15 words
A thermal insulation as in claim 1 having a density of 35 to 65 pcf.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |