Patent US3278261A successfully refreshed from Google Patents.
US3278261A
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Preparation of dense chromic oxide
Assignee: PPG Industries Inc
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Filing: 1965-12-07
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Granted: 1966-10-11
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Expires: 1985-12-07
Abstract
No abstract record available.
Inventors
- 👤 Robert A Kearley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:21
CPC Classifications
C; C01; C01G; C01G37/00; C01G37/02; C01P; C01P2006/00; C01P2006/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
93 words
A PROCESS OF PREPARING A DENSE CHROMIC OXIDE WHICH COMPRISES HEATING CHROMIC OXIDE PRODUCED BY DECOMPOSING A MEMBER OF THE GROUP CONSISTING OF AMMONIUM CHROMATE AND AMMONIUM DICHROMATE IN THE PRESENCE OF A DENSIFYING AMOUNT OF WATER SOLUBLE, FUSIBLE, STABLE, INERT ALKALI METAL HALIDE SOLID TO A TEMPERATURE AT WHICH THE HALIDE FUSES, BUT BELOW THE FUSION POINT OF CHROMIC OXIDE, ADDING THE FUSED HALIDE AND SOLID CHROMIC OXIDE TO WATER TO FORM AN AQUEOUS SLURRY, MAINTAINING THE PH OF THE SLURRY BELOW ABOUT 6.5, FILTERING THE SLURRY, AND RECOVERING DENSE CHROMIC OXICE.
References Cited (Backward Citations)
US2250789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |