US2739904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of neutral inorganic oxide pigments
Assignee: Saeurefabrik Schweizerhall
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Filing: 1951-03-14
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Granted: 1956-03-27
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Expires: 1971-03-14
Abstract
No abstract record available.
Inventors
- 👤 Frey Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:04
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/07; C01G23/075
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
112 words
A PROCESS FOR PREPARING A NEUTRALIZED INORGANIC OXIDE PIGMENT FROM AN ACID FINELY DIVIDED OXIDE OF THE GROUP CONSISTING OF FINELY DIVIDED OXIDES OF SILICON, TITANIUM, ZIRCONIUM, CHROMIUM, IRON AND ALUMINUM PRODUCED BY THE HIGH TEMPERATURE DECOMPOSITION OF A VOLATILE INORGANIC CHLORIDE WITH AN OXYGEN-CONTAINING GAS, WHICH COMPRISES THOROUGHLY MIXING A DRY MASS OF THE OXIDE WITH A FINELY DIVIDED ALKALINE-REACTING ALKALINE EARTH METAL OXY-COMPOUND IN A QUANTITY AT LEAST SUFFICIENT TO NEUTRALIZE ITS ACIDITY, MOISTENING AND MIXING THE MIXTURE EVENLY WITH A LIMITED QUANTITY OF WATER INSUFFICIENT TO CONVERT IT INTO LUMPS OR PASTE, AND THEREAFTER DRYING THE MOIST MATERIAL TO OBTAIN THEREBY A HOMOGENEOUS FINELY DIVIDED PIGMENT FREE OF ACIDITY.
References Cited (Backward Citations)
US2340610A
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US2347496A
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US2367118A
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US2333948A
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US2437171A
Cited
US2559638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |