Patent US2967897A successfully refreshed from Google Patents.
US2967897A
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US
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Isoprene preparation
Assignee: Monsanto Chemicals Ltd
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Filing: 1957-11-13
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Granted: 1961-01-10
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Expires: 1977-11-13
Abstract
No abstract record available.
Inventors
- 👤 Dexter B Sharp
- 👤 Blanc John R Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:49
CPC Classifications
C; C07; C07C; C07C409/00; C07C409/02; C07C409/04; C07C1/00; C07C1/20; C07C1/24; C07C11/00; C07C11/12; C07C11/173; C07C11/18; C07C407/00; C07C2527/00; C07C2527/02; C07C2527/053; Y; Y10; Y10S; Y10S204/00; Y10S204/902; Y10S204/903; Y10S204/904; Y10S585/00; Y10S585/929; Y10S585/93; Y10S585/934
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PROCESS FOR PREPARING ISOPRENE FROM AN ISOPENTENE WHICH COMPRISES PHOTOXIDIZING 2-METHYL-2-BUTENE IN THE PRESENCE OF A PHOTOSENSITIZER TO 2- AND 3-METHYL-3-BUTEN2-YL HYDROPEROXIDES, REDUCING THE SAID HYDROPEROXIDES TO 2- AND 3-METHYL-3-BUTEN-2-OLS, SEPARATING UNREACTED 2METHYL-2-BUTENE FROM REACTION MIXTURE AND RECYCLING IT TO THE PHOTOXIDIZING PROCEDURE, AND DEHYDRATING THE SAID BUTEN-2-OLS TO ISOPRENE.
Claim 2
Dependent Claim
51 words
A PROCESS FOR PREPARING ISOPRENE FROM AN ISOPENTENE WHICH COMPRISES PHOTOXIDIZING 2-METHYL-2-BUTENE IN THE PRESENCE OF A PHOTOSENSITIZER TO 2- AND 3-METHYL-3-BUTEN2-YL HYDROPEROXIDES, REDUCING THE SAID HYDROPEROXIDES TO 2- AND 3-METHYL-3-BUTEN-2-OLS, SEPARATING UNREACTED 2METHYL-2-BUTENE FROM REACTION MIXTURE AND RECYCLING IT TO THE PHOTOXIDIZING PROCEDURE, AND DEHYDRATING THE SAID BUTEN-2-OLS TO ISOPRENE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-10 | 1964-07-11 | 1965-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-10 | 1968-07-11 | 1969-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-10 | 1972-07-11 | 1973-01-10 | $7700.00 | Window Closed / Lapsed |