Patent US2875256A successfully refreshed from Google Patents.
US2875256A
Expired / Lapsed
US
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Dienic hydrocarbons and derivatives thereof
Assignee: Shell Development Co
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Filing: 1953-01-21
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Granted: 1959-02-24
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Expires: 1973-01-21
Abstract
No abstract record available.
Inventors
- 👤 Hyman Julius
- 👤 Freireich Ernest
- 👤 Rex E Lidov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:48
CPC Classifications
C; C07; C07C; C07C13/00; C07C13/28; C07C13/32; C07C13/39; C07C2/00; C07C2/02; C07C2/50; C07C2602/00; C07C2602/36; C07C2602/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
THE CONTINOUS PROCESS FOR PREPARING A BICYCLO(2.2.1)-2,5-HEPTADIENE WHICH COMPRISES CAUSING ACETYLENE AND A DIENE OF THE GROUP CONSISTING OF CYCLOPENTADIENE, ITS MONO-METHYL DERIVATIVES, AND MIXTURE THEREOF IN MOLE RATIOS BETWEEN ONE TO ONE AND TEN TO ONE TO FLOW TOGETHER THROUGH A REACTION ZONE MAINTAINED AT A TEMPERATURE BETWEEN 150* C. AND 400* C. AND A PRESSURE BETWEEN ABOUT ATMOSPHERIC TO ABOUT 250 POUNDS PER SQUARE INCH GAUGE AT ARATE TO CAUSE THE REACTANTS TO REMAIN IN THE REACTION ZONE FOR A PERIOD OF BETWEEN ABOUT ONE TO ABOUT FIFTEEN MINUTES THEREBY PRODUCTING THE DIELSALDER ADDUCT FORMED BY THE REACTION OF ONE MOLE OF SAID DIENE WITH ONE MOLE OF ACETYLENE.
Claim 2
Dependent Claim
111 words
THE CONTINOUS PROCESS FOR PREPARING A BICYCLO(2.2.1)-2,5-HEPTADIENE WHICH COMPRISES CAUSING ACETYLENE AND A DIENE OF THE GROUP CONSISTING OF CYCLOPENTADIENE, ITS MONO-METHYL DERIVATIVES, AND MIXTURE THEREOF IN MOLE RATIOS BETWEEN ONE TO ONE AND TEN TO ONE TO FLOW TOGETHER THROUGH A REACTION ZONE MAINTAINED AT A TEMPERATURE BETWEEN 150* C. AND 400* C. AND A PRESSURE BETWEEN ABOUT ATMOSPHERIC TO ABOUT 250 POUNDS PER SQUARE INCH GAUGE AT ARATE TO CAUSE THE REACTANTS TO REMAIN IN THE REACTION ZONE FOR A PERIOD OF BETWEEN ABOUT ONE TO ABOUT FIFTEEN MINUTES THEREBY PRODUCTING THE DIELSALDER ADDUCT FORMED BY THE REACTION OF ONE MOLE OF SAID DIENE WITH ONE MOLE OF ACETYLENE.
References Cited (Backward Citations)
US2352606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |