US3690906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chrome pigments
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-10-05
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Granted: 1972-09-12
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Expires: 1990-10-05
Abstract
Abstract CHROME PIGMENTS OF IMPROVED DURABILITY, ESPECIALLY TO ATMOSPHERIC SULPHUROUS ACID, ARE OBTAINED BY ADDING TO A STIRRED AQUEOUS SUSPENSION OF A CHROME PIGMENT AT AN INITIAL PH BETWEEN 1.8 AND 9.0 A SOURCE OF SILICATE IONS, A SOURCE OF TRIVALENT ANTIMONY IONS, AN ALKALI METAL HYDROXIDE, A POLYHYDRIC ALCOHOL AND A HYDROXYLAKYLAMINE AND ADJUSTING THE PH TO BETWEEN 3.0 AND 7.0 BY ADDITION OF AN ACIDIC COMPOUND.
Inventors
- 👤 Charles Harold Buckley
- 👤 John Mitchell
- 👤 Geoffrey Lionel Collier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:35
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/06; C09C3/063; C09C1/00; C09C1/14; C09C1/20; C09C1/34; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84
Claims Analysis
Total Claims: 0
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References 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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |