US2997509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of conjugated diolefins
Assignee: British Hydrocarbon Chemicals Ltd
•
Filing: 1959-03-27
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Granted: 1961-08-22
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Expires: 1979-03-27
Abstract
No abstract record available.
Inventors
- 👤 Wirth Max Marin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:59
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/86; C07C2/862; C07C2/867; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
THE PROCESS FOR THE PRODUCTION OF ISOPRENE OF HIGH PURITY FROM ISOBUTENE AND FORMALDEHYDE WHICH COMPRISES REACTING THE ISOBUTENE AND FORMALDEHYDE AT AN ELEVATED TEMPERATURE IN THE RANGE OF 150* TO 400*C. IN THE VAPOR PHASE IN THE PRESENCE OF A COMBINATION CONDENSATION AND DEHYDRATION CATALYST CONSISTING ESSENTIALLY OF BORON PHOSPHATE.
Claim 2
Dependent Claim
51 words
THE PROCESS FOR THE PRODUCTION OF ISOPRENE OF HIGH PURITY FROM ISOBUTENE AND FORMALDEHYDE WHICH COMPRISES REACTING THE ISOBUTENE AND FORMALDEHYDE AT AN ELEVATED TEMPERATURE IN THE RANGE OF 150* TO 400*C. IN THE VAPOR PHASE IN THE PRESENCE OF A COMBINATION CONDENSATION AND DEHYDRATION CATALYST CONSISTING ESSENTIALLY OF BORON PHOSPHATE.
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) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |