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Patent US2917466A successfully refreshed from Google Patents.
US2917466A
Expired / Lapsed
US
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Platinum metal catalysts
Assignee: Shell Development Co
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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 16:03
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)
US1916902A
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 |