US3816149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrated calcium sillicate products
Assignee: Johns Manville Corp
•
Filing: 1972-06-02
•
Granted: 1974-06-11
•
Expires: 1992-06-02
Abstract
Abstract A process is described for the formation of shaped hydrated calcium silicate products. The process comprises reacting a concentrated aqueous slurry of calcium oxide and silica sources in the presence of high pressure saturated steam, then simultaneously cooling and diluting the resultant crystalcontaining slurry by gradual addition of water. Reinforcing fibers may then be added after which the desired shapes are molded and dried.
Inventors
- 👤 J Zettel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:34
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/22; C01B33/24; C04; C04B; C04B28/00; C04B28/18; C04B35/00; C04B35/01; C04B35/16
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
18 words
The process of claim 1 wherein said shaped objects also contain fibrous material incorporated into said concentrated slurry.
Claim 2
Dependent Claim
12 words
The process of claim 2 wherein said fibrous material comprises asbestos fibers.
Claim 3
Dependent Claim
37 words
The process of claim 1 wherein said shaped objects also contain fibrous material incorporated into the dilute slurry following removal of the dilute slurry from said vessel and prior to forming and drying of said shaped objects.
Claim 4
Dependent Claim
12 words
The process of claim 4 wherein said fibrous material is glass fiber.
Claim 5
Dependent Claim
11 words
The process of claim 4 wherein said fibrous material is rayon.
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein said saturated steam is maintained during formation of said crystals at a pressure in the range of 75-500 psig.
Claim 7
Dependent Claim
20 words
The process of claim 7 wherein said saturated steam is maintained at a pressure in the range of 100-250 psig.
Claim 8
Dependent Claim
23 words
The process of claim 1 wherein the crystal formation step is continued for a period of time in the range of 0.5-20 hours.
Claim 9
Dependent Claim
23 words
The process of claim 9 wherein the crystal formation step is continued for a period of time in the range of 2-8 hours.
Claim 10
Dependent Claim
21 words
The process of claim 1 wherein said concentrated slurry has a water:solids weight ratio in the range of 4:1 to 6.5:1.
Claim 11
Dependent Claim
21 words
The process of claim 1 wherein said diluted slurry has a water:solids weight ratio in the range of 12:1 to 20:1.
Claim 12
Dependent Claim
26 words
The process of claim 1 wherein the mole ratio of calcium oxide to silica in said concentrated slurry is in the range of 0.5:1 to 3.0:1.
Claim 13
Dependent Claim
17 words
The process of claim 13 wherein said mole ratio is in the range of 0.75:1 to 2.0:1.
References Cited (Backward Citations)
US2665996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |