US3228991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and catalyst for the preparation of methyl-1, 3-cyclopentadiene
Assignee: Monsanto Co
•
Filing: 1962-03-08
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Granted: 1966-01-11
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Expires: 1982-03-08
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Dulaney
- 👤 Raymond A Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:53
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/89; B01J23/8926; C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333; C07C5/3335; C07C5/3337
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR PRODUCING METHYL-1,3-CYCLOPENTADIENE WHICH COMPRISES INTIMATELY CONTACTING METHYLCYCLOPENTANE AT AN ELEVATED TEMPERATURE OF FROM ABOUT 400 TO ABOUT 600*C. WITH A CATALYST COMPRISING AN INERT, NONACIDIC, HIGH SURFACE AREA CARRIER SELECTED FROM THE GROUP CONSISTING OF SILICA, ALUMINA, AND SILICA-ALUMINA, IMPREGNATED WITH FROM ABOUT 0.05 TO ABOUT 5% BY WEIGHT OF TOTAL COMPOSITION OF A MIXTURE OF PLATINUM AND COPPER CONTAINING COPPER IN THE AMOUNT OF FROM ABOUT 1 TO 90% BY WEIGHT OF SAID MIXTURE, SAID MIXTURE HAVING BEEN PREPARED BY IMPREGNATING SAID CARRIER WITH PLATINUM AND COPPER COMPOUNDS REDUCIBLE TO METALLIC PLATINUM AND COPPER, AND WHICH UPON DECOMPOSITION TO THE METAL LEAVE NO RESITUAL IONS OTHER THAN THE METALLIC IONS.
Claim 2
Dependent Claim
114 words
A PROCESS FOR PRODUCING METHYL-1,3-CYCLOPENTADIENE WHICH COMPRISES INTIMATELY CONTACTING METHYLCYCLOPENTANE AT AN ELEVATED TEMPERATURE OF FROM ABOUT 400 TO ABOUT 600*C. WITH A CATALYST COMPRISING AN INERT, NONACIDIC, HIGH SURFACE AREA CARRIER SELECTED FROM THE GROUP CONSISTING OF SILICA, ALUMINA, AND SILICA-ALUMINA, IMPREGNATED WITH FROM ABOUT 0.05 TO ABOUT 5% BY WEIGHT OF TOTAL COMPOSITION OF A MIXTURE OF PLATINUM AND COPPER CONTAINING COPPER IN THE AMOUNT OF FROM ABOUT 1 TO 90% BY WEIGHT OF SAID MIXTURE, SAID MIXTURE HAVING BEEN PREPARED BY IMPREGNATING SAID CARRIER WITH PLATINUM AND COPPER COMPOUNDS REDUCIBLE TO METALLIC PLATINUM AND COPPER, AND WHICH UPON DECOMPOSITION TO THE METAL LEAVE NO RESITUAL IONS OTHER THAN THE METALLIC IONS.
References Cited (Backward Citations)
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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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |