US3197322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of calcium carbonate and the composition so made
Assignee: Dow Chemical Co
•
Filing: 1962-07-25
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Granted: 1965-07-27
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Expires: 1982-07-25
Abstract
No abstract record available.
Inventors
- 👤 Maskal John
- 👤 Ivan M Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:49
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/18; C01F11/182; C01F11/181; C09; C09C; C09C1/00; C09C1/0081; C09C1/009; C09C1/02; C09C1/021; C01P; C01P2004/00; C01P2004/51; C01P2004/60; C01P2004/61; C01P2004/62; C01P2006/00; C01P2006/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A CALCIUM CARBONATE PRODUCT CONSISTING ESSENTIALLY OF A MIXTURE OF CALCITE AND ARAGONITE CRYSTALS CONTAINING FROM 15 TO 60 WEIGHT PERCENT OF ARAGONITE CRYSTALS, SAID CRYSTALS HAVING A MEDIUM PARTICLE SIZE IN THE RANGE OF BETWEEN ABOUT 0.8 TO 1.2 MICRONS WITH AT LEAST ABOUT 25 WEIGHT PERCENT OF THE CRYSTALS BEING UNDER 0.6 MICRON, AT LEAST ABOUT 13 WEIGHT PERCENT GREATER THAN 2 MICRONS, AND SUBSTANTIALLY ALL OF THE CRYSTALS BEING LESS THAN 10 MICRONS.
Claim 2
Dependent Claim
76 words
A CALCIUM CARBONATE PRODUCT CONSISTING ESSENTIALLY OF A MIXTURE OF CALCITE AND ARAGONITE CRYSTALS CONTAINING FROM 15 TO 60 WEIGHT PERCENT OF ARAGONITE CRYSTALS, SAID CRYSTALS HAVING A MEDIUM PARTICLE SIZE IN THE RANGE OF BETWEEN ABOUT 0.8 TO 1.2 MICRONS WITH AT LEAST ABOUT 25 WEIGHT PERCENT OF THE CRYSTALS BEING UNDER 0.6 MICRON, AT LEAST ABOUT 13 WEIGHT PERCENT GREATER THAN 2 MICRONS, AND SUBSTANTIALLY ALL OF THE CRYSTALS BEING LESS THAN 10 MICRONS.
References Cited (Backward Citations)
US2538802A
Cited
US2941860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |