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US3630673A
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Source composition for alkali metal oxides and alkaline earth metal oxides
Assignee: Dow Chemical Co
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Filing: 1968-04-26
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Granted: 1971-12-28
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Expires: 1988-04-26
Abstract
Abstract This specification discloses a source composition for alkali metal oxides and alkaline earth metal oxides useful, for example, in preparing a final glass product, the composition having a chemical formula of Na2Ca(OH)4.
Inventors
- 👤 William A Mod
- 👤 Donald L Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:30
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/02; C03C1/026
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
The product, for use as a source composition of alkali metal oxides and alkaline earth metal oxides, made by the process of reacting sodium hydroxide with an alkaline earth metal oxide source material at a temperature within the range of from about 60* to about 318* C.; the amount of sodium hydroxide reacted being from about 2 to about 4 moles per mole of alkaline earth metal oxide source material.
Claim 2
Dependent Claim
16 words
The product of claim 2 wherein calcium carbonate is the alkaline earth metal oxide source material.
Claim 3
Dependent Claim
16 words
The product of claim 2 wherein calcium oxide is the alkaline earth metal oxide source material.
Claim 4
Dependent Claim
84 words
The process which comprises reacting an aqueous mixture of sodium hydroxide and an alkaline earth metal oxide source material, selected from the group consisting of calcium carbonate, calcium hydroxide, dolomite and slaked calcined dolomite at a temperature within the range of from about 60* to about 318* C., to form a source composition of alkali metal oxide and alkaline earth metal oxides; the amount of sodium hydroxide being from about 2 to about 4 moles per mole of alkaline earth metal oxide source material.
Claim 5
Dependent Claim
22 words
The process of claim 5 wherein the reaction is carried out at a temperature of from about 100* to about 140* C.
Claim 6
Dependent Claim
16 words
The process of claim 5 wherein the alkaline earth metal oxide source material is calcium carbonate.
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |