US3353927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dissolving rock salt containing calcium sulfate in the presence of an anionic organic wetting agent
Assignee: Calgon Corp
•
Filing: 1961-11-15
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Granted: 1967-11-21
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Expires: 1981-11-15
Abstract
No abstract record available.
Inventors
- 👤 Paul H Ralston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:37
CPC Classifications
C; C01; C01D; C01D3/00; C01D3/04; C01D3/08; B; B03; B03D; B03D1/00; B03D1/02; B03D1/06; C01D3/14; C01D3/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A METHOD OF PREPARING BRINE FROM AN AQUEOUS SOLVENT AND A SOLID ALKALI-METAL HALIDE CONTAINING CALCIUM SULPHATE AS AN IMPURITY COMPRISING ADDING TO THE AQUEOUS SOLVENT NO LATER THAN SIMULTANEOUS WITH THE CONTACT OF THE SOLVENT WITH THE HALIDE A COMPOUND HAVING AT LEAST ONE ACTIVE GROUP SELECTED FROM THE CLASS CONSISTING OF SULPHONATE, SULPHATE, CARBOXYLATE, AND PHOSPHATE, SAID ACTIVE GROUP BEING ATTACHED TO A HYDROCARBON GROUP CONTAINING BETWEEN ABOUT 5 TO 19 CARBON ATOMS PER ACTIVE GROUP, SAID COMPOUND COMBINING WITH CALCIUM TO FORM A PRODUCT THAT IS LESS SOLUBLE THAN CALCIUM SULPHATE.
Claim 2
Independent Claim
94 words
A METHOD OF PREPARING BRINE FROM AN AQUEOUS SOLVENT AND A SOLID ALKALI-METAL HALIDE CONTAINING CALCIUM SULPHATE AS AN IMPURITY COMPRISING ADDING TO THE AQUEOUS SOLVENT NO LATER THAN SIMULTANEOUS WITH THE CONTACT OF THE SOLVENT WITH THE HALIDE A COMPOUND HAVING AT LEAST ONE ACTIVE GROUP SELECTED FROM THE CLASS CONSISTING OF SULPHONATE, SULPHATE, CARBOXYLATE, AND PHOSPHATE, SAID ACTIVE GROUP BEING ATTACHED TO A HYDROCARBON GROUP CONTAINING BETWEEN ABOUT 5 TO 19 CARBON ATOMS PER ACTIVE GROUP, SAID COMPOUND COMBINING WITH CALCIUM TO FORM A PRODUCT THAT IS LESS SOLUBLE THAN CALCIUM SULPHATE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |