Patent US3002846A successfully refreshed from Google Patents.
US3002846A
Expired / Lapsed
US
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Process for the manufacture of inorganic pigments
Assignee: Bayer AG
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Filing: 1957-07-02
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Granted: 1961-10-03
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Expires: 1977-07-02
Abstract
No abstract record available.
Inventors
- 👤 Flasch Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:19
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/04; C01; C01P; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
IN A PROCESS FOR PRODUCING INORGANIC PIGMENTS OF THE GROUP CONSISTING OF ZINC OXIDE, ZINC SULFIDE, LITHOPONE, CADMIUM SULFIDE, TITANIUM OXIDE, IRON OXIDE, CHROMIUM OXIDE AND COBALT PIGMENTS, WHICH INORGANIC PIGMENTS REQUIRE A GRAIN-RIPENING TREATMENT OF THE CRUDE PIGMENT BY A HEAT TREATMENT, THE STEP WHICH CONSISTS OF SUSPENDING SAID CRUDE PIGMENT IN A MELT CONSISTING OF AT LEAST ONE INORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL HALIDES, ALKALINE EARTH METAL HALIDES, CAUSTIC ALKALIS AND MIXTURES THEREOF, FOR THE REQUIRED HEAT TREATMENT AT A TEMPERATURE OF BETWEEN 300 AND 800*C. FOR A PERIOD OF FROM 3 MINUTES TO 3 HOURS.
Claim 2
Dependent Claim
103 words
IN A PROCESS FOR PRODUCING INORGANIC PIGMENTS OF THE GROUP CONSISTING OF ZINC OXIDE, ZINC SULFIDE, LITHOPONE, CADMIUM SULFIDE, TITANIUM OXIDE, IRON OXIDE, CHROMIUM OXIDE AND COBALT PIGMENTS, WHICH INORGANIC PIGMENTS REQUIRE A GRAIN-RIPENING TREATMENT OF THE CRUDE PIGMENT BY A HEAT TREATMENT, THE STEP WHICH CONSISTS OF SUSPENDING SAID CRUDE PIGMENT IN A MELT CONSISTING OF AT LEAST ONE INORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL HALIDES, ALKALINE EARTH METAL HALIDES, CAUSTIC ALKALIS AND MIXTURES THEREOF, FOR THE REQUIRED HEAT TREATMENT AT A TEMPERATURE OF BETWEEN 300 AND 800*C. FOR A PERIOD OF FROM 3 MINUTES TO 3 HOURS.
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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) | 1964-10-02 | 1965-04-03 | 1965-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-02 | 1969-04-03 | 1969-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-02 | 1973-04-03 | 1973-10-03 | $7700.00 | Window Closed / Lapsed |