US3652305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moldable hydrated magnesium oxide and the formation of molded articles therefrom
Assignee: Individual
•
Filing: 1970-02-24
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Granted: 1972-03-28
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Expires: 1990-02-24
Abstract
Abstract A moldable hydrated magnesium oxide and a method of preparing various articles from such material with vitreous surfaces. The material consists mainly of magnesium oxide, ammonium persulfate which acts as a mineralizing agent, and fillers such as aluminum oxide and fine aggregate. When properly combined and formed into a slurry, the mixture can be poured or injected into a mold or extruded and cured at an elevated temperature to form desired articles which will have vitreous or glassy surfaces. A polar organic compound of the glycol or glycol ether class, which functions both as a wetting agent and a protective colloid, is also preferably used in forming the slurry.
Inventors
- 👤 Thomas E Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:21
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1305; C04B35/00; C04B35/01; C04B35/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
37 words
The method according to claim 1 in which the liquid phase consists of 72 percent water, 10 percent of a substance selected from the group consisting of oxidipropanol and oxydiethanol and 18 percent ammonium persulfate by weight.
Claim 2
Dependent Claim
22 words
The method according to claim 8 in which the slurry contains calcined magnesia to water in a ratio at 2:1 by weight.
Claim 3
Dependent Claim
36 words
The method of claim 3 in which the cast product is treated at an elevated temperature for a suitable period to cure to a water content of about 0.9 moles of water per mole of magnesia.
Claim 4
Dependent Claim
24 words
The method according to claim 3 in which the slurry contains up to about 20 percent alumina, 25 percent sand and 55 percent MgO.
References Cited (Backward Citations)
CA471820A
Cited
DE1114138B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |