Patent US4018876A successfully refreshed from Google Patents.
US4018876A
Expired / Lapsed
US
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Process for the production of metal oxalates and soda ash
Assignee: Individual
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Filing: 1975-03-04
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Granted: 1977-04-19
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Expires: 1995-03-04
Abstract
Abstract A process for the simultaneous production of relatively insoluble metal oxalates and carbonates and bicarbonates of alkali metals and ammonium in which a metal carbonate and an ammonium or alkali metal oxalate are combined in water or methanol, optionally with the addition of carbon dioxide.
Inventors
- 👤 Robert Kenneth Jordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:10
CPC Classifications
C; C01; C01D; C01D7/00; C01D7/35; C01D7/37; C01C; C01C1/00; C01C1/26; C01D7/02; C07; C07C; C07C51/00; C07C51/41; C07C51/412
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
78 words
A process for the production of alkali metal carbonates and metal oxalates wherein the metal is other than an alkali metal, which comprises reacting an alkali metal oxalate with a metal carbonate in a liquid media selected from water, methanol, water-methanol mixtures and water acetone mixtures, at a temperature in the range of -30° C to 300° C under conditions sufficient to maintain said liquid media in the liquid state to produce alkali metal carbonate and metal oxalate.
Claim 2
Dependent Claim
78 words
A process for the production of alkali metal carbonates and metal oxalates wherein the metal is other than an alkali metal, which comprises reacting an alkali metal oxalate with a metal carbonate in a liquid media selected from water, methanol, water-methanol mixtures and water acetone mixtures, at a temperature in the range of -30° C to 300° C under conditions sufficient to maintain said liquid media in the liquid state to produce alkali metal carbonate and metal oxalate.
Claim 3
Dependent Claim
23 words
A method according to claim 1 wherein the pH of the reaction is maintained below about 11 by the addition of carbon dioxide.
Claim 4
Dependent Claim
20 words
The process of claim 1 where said metal carbonate is calcium carbonate and said alkali metal oxalate is sodium oxalate.
References Cited (Backward Citations)
US1687480A
Cited
US2002342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |