Black fe-cr oxide pigment composition
Abstract
Abstract AND A PROCESS FOR THE PRODUCTION THEREOF BY ANNEALING, E.G. AT 1000 TO 1300*C., A MIXTURE OF OXIDES AND/OR OXIDE-FORMING COMPOUNDS, E.G. HEAT-DECOMPOSABLE HYDROXIDES, ACIDS, SALTS, ETC., OF IRON, CHROMIUM, SODIUM AND PHOSPHORUS, WHICH MIXTURE CONTAINS, PER GRAM-ATOM OF IRON, THE FOLLOWING CONSTITUENTS: 0.7 TO 1.0 GRAM-ATOM OF CHROMIUM 0.005 TO 0.2 GRAM-ATOM OF SODIUM 0.005 TO 0.05 GRAM-ATOM OF PHOSPHORUS AND THEREAFTER GRINDING, WASHING AND DRYING THE ANNEALED MATERIAL, E.G. TO A PARTICLE SIZE OF ABOUT 0.1 TO 60 UM., PREFERABLY 2 TO 20 UM. F2O3-(0.7-1.0)CR2O3 BLACK ENAMEL AND CERAMIC COLORING SUBSTANCE IN THE FORM OF A FE-CR OXIDE HAVING CORUNDUM STRUCTURE AND A MOLAR COMPOSITION OF ABOUT
Inventors
- 👤 Horst Weber
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |