US2904520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of active contact masses from kaolin clays
Assignee: Houdry Process Corp
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Filing: 1955-05-16
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Granted: 1959-09-15
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Expires: 1975-05-16
Abstract
No abstract record available.
Inventors
- 👤 Joseph J Donovan
- 👤 Jr Thomas Henry Milliken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:16
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
THE METHOD OF PREPARING ACTIVE CRACKING CATALYSTS FROM KAOLIN CLAYS WHICH COMPRISES SULFATING SUCH CLAY TO A SULFATE CONTENT OF AT LEAST 10% ON THE DRY WEIGHT OF THE CLAY AND THEREAFTER SUBJECTING THE CLAY TO TREATMENT INCLUDING DECOMPOSITION OF THE METAL SULFATES FORMED THEREIN BY SUCH SULFATING, SAID DECOMPOSITION BEING EFFECTED BY REDUCTION OF SUCH METAL SULFATES IN A GASEOUS ATMOSPHERE INCLUDING A REDUCING GAS AND AT ELEVATED TEMPERATURE IN THE RANGE OF 750-1600* F.
Claim 2
Independent Claim
76 words
THE METHOD OF PREPARING ACTIVE CRACKING CATALYSTS FROM KAOLIN CLAYS WHICH COMPRISES SULFATING SUCH CLAY TO A SULFATE CONTENT OF AT LEAST 10% ON THE DRY WEIGHT OF THE CLAY AND THEREAFTER SUBJECTING THE CLAY TO TREATMENT INCLUDING DECOMPOSITION OF THE METAL SULFATES FORMED THEREIN BY SUCH SULFATING, SAID DECOMPOSITION BEING EFFECTED BY REDUCTION OF SUCH METAL SULFATES IN A GASEOUS ATMOSPHERE INCLUDING A REDUCING GAS AND AT ELEVATED TEMPERATURE IN THE RANGE OF 750-1600* F.
References Cited (Backward Citations)
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US2044341A
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US2192000A
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US2438451A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |