Patent US3245819A successfully refreshed from Google Patents.
US3245819A
Expired / Lapsed
US
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Stabilization of calcium carbonate slurries
Assignee: Wyandotte Chemicals Corp
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Filing: 1962-07-30
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Granted: 1966-04-12
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Expires: 1982-07-30
Abstract
No abstract record available.
Inventors
- 👤 Robert E Eberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:02
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/02; C01; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A PROCESS FOR STABILIZING A HIGH SOLIDS, AQUEOUS SLURRY OF CALCITIC CALCIUM CARBONATE AGAINST FORMATION OF A NONFLOWABLE MASS COMPRISING MAINTAINING SAID SLURRY AT A PH GREATER THAN ABOUT 7.5 BY PERIODICALLY ADDING AN ALKALINE AGENT TO SAID SLURRY AS NEEDED.
Claim 2
Dependent Claim
41 words
A PROCESS FOR STABILIZING A HIGH SOLIDS, AQUEOUS SLURRY OF CALCITIC CALCIUM CARBONATE AGAINST FORMATION OF A NONFLOWABLE MASS COMPRISING MAINTAINING SAID SLURRY AT A PH GREATER THAN ABOUT 7.5 BY PERIODICALLY ADDING AN ALKALINE AGENT TO SAID SLURRY AS NEEDED.
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) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |