US2900429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of isoprene
Assignee: Houdry Process Corp
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Filing: 1957-04-05
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Granted: 1959-08-18
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Expires: 1977-04-05
Abstract
No abstract record available.
Inventors
- 👤 Heinemann Heinz
- 👤 Jr Thomas Henry Milliken
- 👤 Stevenson Donald Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:08
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/12; C07C11/173; C07C11/18; C07C5/00; C07C5/02; C07C5/03; C07C5/05; C07C5/22; C07C5/27; C07C5/2767; C07C5/277; C07C5/32; C07C5/327; C07C5/333; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/16; C07C2523/24; C07C2523/26; C07C2523/70; C07C2523/72; C07C2523/74; C07C2523/755; C07C2527/00; C07C2527/02; C07C2527/04; C07C2527/043; C07C2527/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A METHOD FOR THE SELECTIVE PREPARATION OF ISOPRENE FROM ACYCLIC C5 HYDROCARBONS, WHICH COMPRISES DEHYDROGENATING A CHARGE OF SUCH C5 HYDROCARBONS PRODUCING AN EFFLUENT CONTAINING DIOLEFINS AND MONOOLEFINS, SEPARATING SAID EFFLUENT INTO AT LEAST THREE SEPARATE STREAMS COMPRISING RESPECTIVELY SUBSTANTIALLY ALL HYDROCARBONS BELOW C5 PLUS HYDROGEN AS A FIRST STREAM, SUBSTANTIALLY ONLY C5 DIOLEFINS AS A SECOND STREAM, AND A THIRD STREAM CONTAINING C5 MONOOLEFINS, SEPARATING SAID C5 DIOLEFIN STREAM INTO AN OVERHEAD FRACTION OF PRODUCT ISOPREME AND A
Claim 2
Independent Claim
79 words
A METHOD FOR THE SELECTIVE PREPARATION OF ISOPRENE FROM ACYCLIC C5 HYDROCARBONS, WHICH COMPRISES DEHYDROGENATING A CHARGE OF SUCH C5 HYDROCARBONS PRODUCING AN EFFLUENT CONTAINING DIOLEFINS AND MONOOLEFINS, SEPARATING SAID EFFLUENT INTO AT LEAST THREE SEPARATE STREAMS COMPRISING RESPECTIVELY SUBSTANTIALLY ALL HYDROCARBONS BELOW C5 PLUS HYDROGEN AS A FIRST STREAM, SUBSTANTIALLY ONLY C5 DIOLEFINS AS A SECOND STREAM, AND A THIRD STREAM CONTAINING C5 MONOOLEFINS, SEPARATING SAID C5 DIOLEFIN STREAM INTO AN OVERHEAD FRACTION OF PRODUCT ISOPREME AND A
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) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |