Patent US2845337A successfully refreshed from Google Patents.
US2845337A
Expired / Lapsed
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Method of altering crystallizing characteristics of calcium sulfate
Assignee: Diamond Shamrock Corp
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Filing: 1952-07-31
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Granted: 1958-07-29
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Expires: 1972-07-31
Abstract
No abstract record available.
Inventors
- 👤 Clyde B Myers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:16
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/46; B; B01; B01J; B01J2/00; B01J2/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE METHOD OF ALTERING THE CRYSTAL HABIT AND TENDENCY FOR CRYSTAL OVER-GROWTH OF CALCIUM SULFATE DEPOSITED FROM CONCENTRATED CALCIUM CHLORIDE-CONTAINING BRINE HAVING A RELATIVELY LOW CONCENTRATION OF SULFATE ION, WHICH INCLUDES THE STEPS OF ADDING TO A BODY OF SUCH BRINE AN ALKALI METAL SALT OF A HYDROLYZATE OBTAINED BY THE ALKALINE HYDROLYSIS OF LIGNIN SULFONIC ACID, SAID HYDROLYZATE HAVING CARBOXYL GROUPS AND AT LEAST SOME RESIDUAL SULFONIC ACID GROUPS IN THE MOLECULES THEREOF, AND SUBJECTING SAID BRINE TO AGITATION, FOLLOWING THE ADDITION THERETO OF SAID SALT.
Claim 2
Independent Claim
87 words
THE METHOD OF ALTERING THE CRYSTAL HABIT AND TENDENCY FOR CRYSTAL OVER-GROWTH OF CALCIUM SULFATE DEPOSITED FROM CONCENTRATED CALCIUM CHLORIDE-CONTAINING BRINE HAVING A RELATIVELY LOW CONCENTRATION OF SULFATE ION, WHICH INCLUDES THE STEPS OF ADDING TO A BODY OF SUCH BRINE AN ALKALI METAL SALT OF A HYDROLYZATE OBTAINED BY THE ALKALINE HYDROLYSIS OF LIGNIN SULFONIC ACID, SAID HYDROLYZATE HAVING CARBOXYL GROUPS AND AT LEAST SOME RESIDUAL SULFONIC ACID GROUPS IN THE MOLECULES THEREOF, AND SUBJECTING SAID BRINE TO AGITATION, FOLLOWING THE ADDITION THERETO OF SAID SALT.
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) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |