Patent US3025248A successfully refreshed from Google Patents.
US3025248A
Expired / Lapsed
US
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Manufacture of platinum-alumina catalyst
Assignee: ExxonMobil Oil Corp
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Filing: 1959-07-30
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Granted: 1962-03-13
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Expires: 1979-07-30
Abstract
No abstract record available.
Inventors
- 👤 Stephen M Oleck
- 👤 Edward J Rosinski
- 👤 Stephen J Wantuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:04
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; B01J21/00; B01J21/02; B01J21/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
A METHOD FOR MANUFACTURE OF A PLATINUM-ALUMINA CATALYST CHARACTERIZED BY UNUSUAL PHYSICAL STRENGTH AND CONSISTING ESSENTIALLY OF ALUMINA MADE UP OF GAMMA AND ETA ALUMINA AND HAVING DEPOSITED THEREON A MINOR HYDROUS ALUNTION OF PLATINUM WHICH COMPRISES FORMING HYDROUS ALUMINA HAVING A PHASE COMPOSITION, ON A TOTAL SOLIDS BASIS, OF ABOUT 5 TO ABOUT PERCENT BY WEIGHT ALPHA ALUMINA MONOHYDRATE AND ABOUT 50 TO ANOUT 95 PERCENT BY WEIGHT OF ALUMINA TRIHYDRATE PREDOMINATELY IN THE FORM OF BETA ALUMINA TRIHYDRATE, IMPREGNATING SAID HYDROUS ALUMINA WITH A SOLUTION OF A PLATINUM COMPOUND OF CONCENTRATION SUFFICIENT TO AFFORD A PLATINUM CONTENT OF BETWEEN ABOUT 901 AND ABOUT 5 PERCENT BY WEIGHT OF THE ULTIMATE CATALYST, DRYING THE RESULTING COMPOSITE, MIXING THE DRIED COMPOSITE WITH AN AQUEOUS NITRIC ACID SOLUTION CONTAINING NOT MORE THAN ABOUT 5 PERCENT BY WEIGHT OF NITRIC ACID BASED ON THE WEIGHT OF ALUMINA, DRYING AND CALCINING THE RESULTING MIXTURE AT AN ELEVATED TEMPERATION SUFFICIENT TO CONVERT THE ALPHA ALUMINA MONOHYDRATE COMPONENT THEREOF TO GAMMA ALUMINA AND THE BETA ALUMINA TRIHYDRATE COMPONENT THEREOF TO ETA ALUMINA.
Claim 2
Independent Claim
177 words
A METHOD FOR MANUFACTURE OF A PLATINUM-ALUMINA CATALYST CHARACTERIZED BY UNUSUAL PHYSICAL STRENGTH AND CONSISTING ESSENTIALLY OF ALUMINA MADE UP OF GAMMA AND ETA ALUMINA AND HAVING DEPOSITED THEREON A MINOR HYDROUS ALUNTION OF PLATINUM WHICH COMPRISES FORMING HYDROUS ALUMINA HAVING A PHASE COMPOSITION, ON A TOTAL SOLIDS BASIS, OF ABOUT 5 TO ABOUT PERCENT BY WEIGHT ALPHA ALUMINA MONOHYDRATE AND ABOUT 50 TO ANOUT 95 PERCENT BY WEIGHT OF ALUMINA TRIHYDRATE PREDOMINATELY IN THE FORM OF BETA ALUMINA TRIHYDRATE, IMPREGNATING SAID HYDROUS ALUMINA WITH A SOLUTION OF A PLATINUM COMPOUND OF CONCENTRATION SUFFICIENT TO AFFORD A PLATINUM CONTENT OF BETWEEN ABOUT 901 AND ABOUT 5 PERCENT BY WEIGHT OF THE ULTIMATE CATALYST, DRYING THE RESULTING COMPOSITE, MIXING THE DRIED COMPOSITE WITH AN AQUEOUS NITRIC ACID SOLUTION CONTAINING NOT MORE THAN ABOUT 5 PERCENT BY WEIGHT OF NITRIC ACID BASED ON THE WEIGHT OF ALUMINA, DRYING AND CALCINING THE RESULTING MIXTURE AT AN ELEVATED TEMPERATION SUFFICIENT TO CONVERT THE ALPHA ALUMINA MONOHYDRATE COMPONENT THEREOF TO GAMMA ALUMINA AND THE BETA ALUMINA TRIHYDRATE COMPONENT THEREOF TO ETA ALUMINA.
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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) | 1965-03-12 | 1965-09-11 | 1966-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-12 | 1969-09-11 | 1970-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-12 | 1973-09-11 | 1974-03-13 | $7700.00 | Window Closed / Lapsed |