US3276894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron oxide pigments containing manganese
Assignee: Bayer AG
•
Filing: 1964-09-25
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Granted: 1966-10-04
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Expires: 1984-09-25
Abstract
No abstract record available.
Inventors
- 👤 Hund Franz
- 👤 Koller Heinz
- 👤 Rade Dieter
- 👤 Quast Hein
- 👤 Ganter Karl-Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:19
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/22; C09C1/24; C01; C01G; C01G49/00; C01G49/02; C01G49/06; C01P; C01P2002/00; C01P2002/50; C01P2002/52
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
HEAT RESISTANT MANGANESE-CONTAINING IRON OXIDE PIGMENT WITH UNIFORM HEMATITLE STRUCTURE PRODUCED BY THE PROCESS WHICH COMPRISES OXIDIZING IRON WITH AN AROMATIC NITRO COMPOUND IN THE PRESENCE OF IRON (II) SALT SOLUTION AT A PH-VALUE OF THE RESULTING SUSPENSION BETWEEN ABOUT 3.5 TO 6.5 AND IN THE PRESENCE OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF MANGANESE METAL AND MANGANESE COMPOUNDS WITH THE RATIO BETWEEN THE ADDED QUANTITIES OF IRON AND MANGANESE AS MANGANESE COMPOUNDS BEING 100:1 TO 5:1, AND WORKING UP THE PIGMENT SLUDGE BY FILTERING, WASHING AND CALCINING TO TEMPERATURES OF BETWEEN 600 TO 800*C.
References Cited (Backward Citations)
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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) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |