Patent US5219377A successfully refreshed from Google Patents.
Patent US3281353A successfully refreshed from Google Patents.
US3281353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation processes using molecular sieves
Assignee: BP PLC
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Filing: 1963-04-16
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Granted: 1966-10-25
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Expires: 1983-04-16
Abstract
No abstract record available.
Inventors
- 👤 Yeo Alan Arthur
- 👤 Hicks Clive Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:31
CPC Classifications
C; C10; C10G; C10G25/00; C10G25/02; C10G25/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A PROCESS FOR THE SEPARATION OF STRAIGHT-CHAIN HYDROCARBONS FROM PETROLEUM FRACTIONS BOILING AT LEAST WITHIN THE RANGE C10-C20 BY MEANS OF A 5 A. MOLECULAR SIEVE USING SUCCESSIVE ABSORPTION AND DESOPRTION STAGES COMPRISING CONTACTING THE FEEDSTOCK IN A PRETREATMENT STAGE WITH A 5 A. MOLECULAR SIEVE AT A TEMPERATURE IN THE RANGE OF 300-450*C. AND AT LEAST AS HIGH AS THAT TEMPERATURE TO BE EMPLOYED IN THE SUBSEQUENT ABSORPTION STAGE OF THE PROCESS AND SUFFICIENTLY HIGH TO MAINTAIN VAPOR PHASE OPERATION IN SAID PRETREATMENT ZONE, CONTACTING THE PRETREATED FEEDSTOCK AT AN ELEVATED TEMPERATURE WITH A 5 A. MOLECULAR SIEVE IN AN ABSORPTION STAGE, SUBJECTING
Claim 2
Dependent Claim
104 words
A PROCESS FOR THE SEPARATION OF STRAIGHT-CHAIN HYDROCARBONS FROM PETROLEUM FRACTIONS BOILING AT LEAST WITHIN THE RANGE C10-C20 BY MEANS OF A 5 A. MOLECULAR SIEVE USING SUCCESSIVE ABSORPTION AND DESOPRTION STAGES COMPRISING CONTACTING THE FEEDSTOCK IN A PRETREATMENT STAGE WITH A 5 A. MOLECULAR SIEVE AT A TEMPERATURE IN THE RANGE OF 300-450*C. AND AT LEAST AS HIGH AS THAT TEMPERATURE TO BE EMPLOYED IN THE SUBSEQUENT ABSORPTION STAGE OF THE PROCESS AND SUFFICIENTLY HIGH TO MAINTAIN VAPOR PHASE OPERATION IN SAID PRETREATMENT ZONE, CONTACTING THE PRETREATED FEEDSTOCK AT AN ELEVATED TEMPERATURE WITH A 5 A. MOLECULAR SIEVE IN AN ABSORPTION STAGE, SUBJECTING
References Cited (Backward Citations)
US2899474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |