US3673101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing improved carbide microspheres from ion exchange resins
Assignee: WR Grace and Co
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Filing: 1969-12-08
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Granted: 1972-06-27
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Expires: 1989-12-08
Abstract
Abstract A process for controlling the amount of sulfur in metal carbide plus carbon microspheres made from ion exchange resins in which the microspheres are desulfurized by heating under hydrogen, hydrogen plus water or carbon monoxide plus water, at temperatures of 500-900* C. for times of 3 to 25 hours.
Inventors
- 👤 Robert Lee Mckenney Jr
- 👤 Jacob Block
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:31
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/90; C01P; C01P2004/00; C01P2004/80
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
39 words
The process according to claim 1 wherein the spheres containing from about 5 to 40 weight percent metal ion are heated, in step (c), in an atmosphere of hydrogen and steam for a period of 3 to 25 hours.
Claim 2
Dependent Claim
41 words
The process according to claim 1 wherein the resin spheres are contacted with an aqueous hafnyl chloride solution, dried and heated to about 600*-700* C. in an atmosphere of hydrogen and water for a period of about 5 to 7 hours.
Claim 3
Dependent Claim
55 words
The process according to claim 1 wherein the dried spheres are contacted in a furnace with a stream of hydrogen and water in which the hydrogen is fed at a rate of 1 to 8 liters per minute and the water at a rate of 0.02 to 0.1 moles per gram of resin per hour.
References Cited (Backward Citations)
US3334050A
Cited
US3403008A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |