Patent EP0522637A2 successfully refreshed from Google Patents.
Patent US3140915A successfully refreshed from Google Patents.
US3140915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of inhibiting dissolution of calcium sulfate
Assignee: Freeport Minerals Co
•
Filing: 1962-08-13
•
Granted: 1964-07-14
•
Expires: 1982-08-13
Abstract
No abstract record available.
Inventors
- 👤 Bernard A Axelrad
- 👤 Raphael F Matson
- 👤 Freddie J Touro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:03
CPC Classifications
C; C01; C01D; C01D3/00; C01D3/04; C01D3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A METHOD FOR INHIBITING THE DISSOLUTION OF CALCIUM SULPHATE INTO AN AQUEOUS SOLVENT COMPRISING DISPERSING INTO THE AQUEOUS SOLVENT AN INHIBITING COMPOUND HAVING AT LEAST ONE ACTIVE GROUP SELECTED FROM THE CLASS CONSISTING OF SULPHONATE, SULPHATE, CARBOXYLATE, PHOSPHATE, PHOSPHITE, PHOSPHONATE AND PHOSPHONITE RADICALS, SAID ACTIVE GROUP BEING ATTACHED TO AT LEAST ONE HYDROCARBON GROUP CONTAINING FROM ABOUT 2 TO 30 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
81 words
A METHOD FOR INHIBITING THE DISSOLUTION OF CALCIUM SULPHATE INTO AN AQUEOUS SOLVENT COMPRISING DISPERSING INTO THE AQUEOUS SOLVENT AN INHIBITING COMPOUND HAVING AT LEAST ONE ACTIVE GROUP SELECTED FROM THE CLASS CONSISTING OF SULPHONATE, SULPHATE, CARBOXYLATE, PHOSPHATE, PHOSPHITE, PHOSPHONATE AND PHOSPHONITE RADICALS, SAID ACTIVE GROUP BEING ATTACHED TO AT LEAST ONE HYDROCARBON GROUP CONTAINING FROM ABOUT 2 TO 30 CARBON ATOMS PER ACTIVE GROUP, SAID COMPOUND COMBINING WITH CALCIUM TO FORM A PRODUCT THAT IS LESS SOLUBLE THAN CALCIUM SULPHATE.
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) | 1967-07-14 | 1968-01-13 | 1968-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-14 | 1972-01-13 | 1972-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-14 | 1976-01-13 | 1976-07-14 | $7700.00 | Window Closed / Lapsed |