US4478742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of a ferric acetate coated silica sol by selective anion exchange
Assignee: ChampionX LLC
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Filing: 1983-05-10
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Granted: 1984-10-23
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Expires: 2003-05-10
Abstract
Abstract A method of producing iron acetate coated silica sol which comprises the steps of passing a mixture of ion-free colloidal silica and an inorganic iron salt in contact with a strong base anion exchange resin in the acetic acid salt form under conditions whereby the iron salt is converted to the iron acetate and is coated on the silica sol, thereby producing an iron acetate coated silica sol.
Inventors
- 👤 Charles C. Payne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:47
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/146; C01B33/149; G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/712
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
68 words
A method of producing iron acetate coated silica sol which comprises the steps of passing a mixture of ion-free colloidal silica and an inorganic iron salt in contact with a strong base anion exchange resin in the acetic acid salt form under conditions whereby the iron salt is converted to the iron acetate and is coated on the silica sol, thereby producing an iron acetate coated silica sol.
Claim 2
Independent Claim
68 words
A method of producing iron acetate coated silica sol which comprises the steps of passing a mixture of ion-free colloidal silica and an inorganic iron salt in contact with a strong base anion exchange resin in the acetic acid salt form under conditions whereby the iron salt is converted to the iron acetate and is coated on the silica sol, thereby producing an iron acetate coated silica sol.
Claim 3
Dependent Claim
12 words
The method of claim 1 where the iron salt is ferric sulfate.
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) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |