US2581088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fractionation of gaseous mixtures
Assignee: Standard Oil Development Co
•
Filing: 1947-11-03
•
Granted: 1952-01-01
•
Expires: 1967-11-03
Abstract
No abstract record available.
Inventors
- 👤 Lewis D Etherington
- 👤 Harold W Scheeline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:09
CPC Classifications
C; C07; C07C; C07C9/00; C07C9/02; C07C9/04; F; F25; F25J; F25J3/00; F25J3/02; F25J2210/00; F25J2210/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A METHOD OF SUPPLYING THE HEAT REQUIREMENTS IN THE FRACTIONAL DISTILLATION OF A MIXTURE OF NORMALLY GASEOUS HYDROCARBONS WHICH COMPRISES PASSING THE SAID NORMALLY GASEOUS HYDROCARBONS INTO A DISTILLATION ZONE HAVING AT LEAST TWO EXTRANEOUSLY CONTROLLED HEATING MEDIA BELOW THE POINT OF FEED INLET MAINTAINED AT DIFFERENT TEMPERATURE LEVELS.
Claim 2
Independent Claim
49 words
A METHOD OF SUPPLYING THE HEAT REQUIREMENTS IN THE FRACTIONAL DISTILLATION OF A MIXTURE OF NORMALLY GASEOUS HYDROCARBONS WHICH COMPRISES PASSING THE SAID NORMALLY GASEOUS HYDROCARBONS INTO A DISTILLATION ZONE HAVING AT LEAST TWO EXTRANEOUSLY CONTROLLED HEATING MEDIA BELOW THE POINT OF FEED INLET MAINTAINED AT DIFFERENT TEMPERATURE LEVELS.
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |