Patent US2818348A successfully refreshed from Google Patents.
US2818348A
Expired / Lapsed
US
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Modified iron oxide pigments
Assignee: EIDP Inc
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Filing: 1954-04-07
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Granted: 1957-12-31
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Expires: 1974-04-07
Abstract
No abstract record available.
Inventors
- 👤 Jackson Julius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:05
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/22; C09C1/24; C01; C01P; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS FOR PREPARING A MODIFIED HYDROUS FERRIC OXIDE PIGMENT WHICH COMPRISES HOT DIGESTING FOR AT LEAST ONE HOUR AND UP TO ABOUT 3 HOURS AT A TEMPERATURE OF FROM 75*C TO BELOW THE BOIL AND AT A PH OF FROM 3-9 PRECIPITATED HYDROUS FERRIC OXIDE IN THE PRESENCE OF A SULFUR-CONTAINING COMPOUND SELECTED FROM THE GROUP CONSISTING OF RSO3H AND R-O-SO2H AND THEIR CORRESPONDING LITHIUM, SODIUM, POTASSIUM, AND AMMONIUM SALTS WHEREIN R IS AN ALIPHATIC-AROMATIC HYDROCARBON RADICAL, CONTAINING AT LEAST 10 CARBON ATOMS, EMPLOYING ONE MOLECULAR EQUIVALENT OF SAID SULFUR-CONTAINING COMPOUND PER 5-7 MOLECULAR EQUIVALENTS OF FERRIC HYDRATE UNDER TREATMENT, AND THEREAFTER TREATING THE RESULTING PRODUCT WITH A SMALL AMOUNT OF AN ORGANIC NITROGEN BASE CATION-ACTIVE FLOCCULATING AGENT.
Claim 2
Dependent Claim
119 words
A PROCESS FOR PREPARING A MODIFIED HYDROUS FERRIC OXIDE PIGMENT WHICH COMPRISES HOT DIGESTING FOR AT LEAST ONE HOUR AND UP TO ABOUT 3 HOURS AT A TEMPERATURE OF FROM 75*C TO BELOW THE BOIL AND AT A PH OF FROM 3-9 PRECIPITATED HYDROUS FERRIC OXIDE IN THE PRESENCE OF A SULFUR-CONTAINING COMPOUND SELECTED FROM THE GROUP CONSISTING OF RSO3H AND R-O-SO2H AND THEIR CORRESPONDING LITHIUM, SODIUM, POTASSIUM, AND AMMONIUM SALTS WHEREIN R IS AN ALIPHATIC-AROMATIC HYDROCARBON RADICAL, CONTAINING AT LEAST 10 CARBON ATOMS, EMPLOYING ONE MOLECULAR EQUIVALENT OF SAID SULFUR-CONTAINING COMPOUND PER 5-7 MOLECULAR EQUIVALENTS OF FERRIC HYDRATE UNDER TREATMENT, AND THEREAFTER TREATING THE RESULTING PRODUCT WITH A SMALL AMOUNT OF AN ORGANIC NITROGEN BASE CATION-ACTIVE FLOCCULATING AGENT.
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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) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |