US2941860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing finely divided caco3
Assignee: Diamond Shamrock Corp
•
Filing: 1956-07-10
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Granted: 1960-06-21
•
Expires: 1976-07-10
Abstract
No abstract record available.
Inventors
- 👤 Roger L Annis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:58
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/02; C09C1/021; B; B82; B82Y; B82Y30/00; C01; C01F; C01F11/00; C01F11/18; C01F11/181; C01P; C01P2004/00; C01P2004/60; C01P2004/62; C01P2004/64
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
48 words
5% TO 1.5 BY WEIGHT OF CALCIUM CARBONATE OF A PARTICLE SIZE FROM ABOUT 0.03 TO 0.15 MICRONS, BASED ON THE FINAL WEIGHT OF CALCIUM CARBONALTE PRODUCT, HEATING THE REACTION MIXTURE TO A TEMPERATURE OF ABOUT 20*C. TO 50* C. WITH VIGOROUS AGITATION AND SEPARATING THE PRECIPITATED PRODUCT.
References Cited (Backward Citations)
US1378595A
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US2062255A
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US2137675A
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US2164943A
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US2141458A
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US2538802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |