US2917466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Platinum metal catalysts
Assignee: Shell Development Co
•
Filing: 1951-12-11
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Granted: 1959-12-15
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Expires: 1971-12-11
Abstract
No abstract record available.
Inventors
- 👤 Miroslav W Tamele
- 👤 Nozaki Kenzie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:10
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; B01J21/00; B01J21/16; B01J37/00; B01J37/02; B01J37/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
9. THE METHOD FOR PREPARING AN ACIDIC SUPPORTED PLATINUM CATALYST WHICH COMPRISES PREPARING A SUBSTANTIALLY NEUTRAL AQUEOUS SOLUTION OF TETRAMMINE PLATINOUS CHLORIDE, SOAKING IN SAID SOLUTION AN ACIDIC SILICA-ALIMINA CRACKING CATLYST THE NORMAL ACIDITY OF WHICH IS NEUTRALIZED BY A NON-VOLATILE ALKAI THERBY TO IMPREGNATE THE CRACKING CATALYST WITH PLATINUM, DRYING THE SOAKED CRACKING CATALYST, SUBJECTING THE DRIED CRACKING CATALYST TO A REDUCTION TREATMENT TO REDUCE THE PLATINUM TO A METALLIC STATE, AND LEACHING THE REDUCED CATALYST WITH ACID TO REMOVE NON-VOLATILE ALKALI WITH WHICH THE NORMAL ACIDITY WAS NEUTRALIZED THEREBY RESTORING SAID NORMAL ACIDITY.
Claim 2
Dependent Claim
95 words
9. THE METHOD FOR PREPARING AN ACIDIC SUPPORTED PLATINUM CATALYST WHICH COMPRISES PREPARING A SUBSTANTIALLY NEUTRAL AQUEOUS SOLUTION OF TETRAMMINE PLATINOUS CHLORIDE, SOAKING IN SAID SOLUTION AN ACIDIC SILICA-ALIMINA CRACKING CATLYST THE NORMAL ACIDITY OF WHICH IS NEUTRALIZED BY A NON-VOLATILE ALKAI THERBY TO IMPREGNATE THE CRACKING CATALYST WITH PLATINUM, DRYING THE SOAKED CRACKING CATALYST, SUBJECTING THE DRIED CRACKING CATALYST TO A REDUCTION TREATMENT TO REDUCE THE PLATINUM TO A METALLIC STATE, AND LEACHING THE REDUCED CATALYST WITH ACID TO REMOVE NON-VOLATILE ALKALI WITH WHICH THE NORMAL ACIDITY WAS NEUTRALIZED THEREBY RESTORING SAID NORMAL ACIDITY.
References Cited (Backward Citations)
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Cited
US2283172A
Cited
US2329307A
Cited
US2550531A
Cited
US2635080A
Cited
US2623860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-14 | 1963-06-15 | 1963-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-14 | 1967-06-15 | 1967-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-14 | 1971-06-15 | 1971-12-15 | $7700.00 | Window Closed / Lapsed |