US2636830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calcium aluminate-carbonate product and method of making the same
Assignee: Alcoa Corp
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Filing: 1949-11-10
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Granted: 1953-04-28
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Expires: 1969-11-10
Abstract
No abstract record available.
Inventors
- 👤 James R Wall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:55
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/78; C01F7/784; C01F7/785
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
COMPOSITION OF MATTER CONTAINING AT LEAST 50 PER CENT BY WEIGHT OF THE COMPOUND 4CAO.AL203.C02, THE BALANCE CONSISTING ESSENTIALLY OF AT LEAST ONE COMPOUND OF THE GROUP CONSISTING OF 3CAO.AL203 AND CAC03, BEING THE DRIED PRECIPITATE OF AN AQUEOUS SLURRY OF MILK LIME, ALKALI METAL ALUMINATE AND SOLUBLE CARBONATE, AND SAID COMPOSITION BEING CHARACTERIZED BY AN APPARENT DENSITY OF LESS THAN 30 POUNDS PER CUBIC FOOT AND BY THE FURTHER FACT THAT THE MAJORITY OF THE PARTICLES ARE OF THE ORDER OF 2 TO 3 MICRONS OR LESS IN MAXIMUM DIMENSIONS.
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) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |