US2964382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of precipitated calcium carbonate
Assignee: Wyandotte Chemicals Corp
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Filing: 1958-04-04
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Granted: 1960-12-13
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Expires: 1978-04-04
Abstract
No abstract record available.
Inventors
- 👤 Jr George E Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:57
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/18; C01F11/181
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
59 words
A PROCESS FOR PREPARING A FINELY DIVIDED, PRECIPITATED CALCIUM CARBONATE, WHICH COMPRISES CONTACTING CALCIUM IONS AND CARBONATE IONS IN A FIELD OF ANTI-COMPOSITING FORCES DISPOSED WITHIN AN AQUEOUS PRECIPITATION ZONE SO AS TO FORM A CALCIUM CARBONATE SLURRY, SAID ANTI-COMPOSITING FORCES IMPARTING HIGH SHEAR, INTENSE TURBULENCE AND A LINEAR VELOCITY OF AT LEAST ABOUT 1160 FEET PER MINUTE A
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) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |