US2673456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of low boiling gas mixtures
Assignee: Standard Oil Development Co
•
Filing: 1949-06-16
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Granted: 1954-03-30
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Expires: 1969-06-16
Abstract
No abstract record available.
Inventors
- 👤 Walter G Scharmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:47
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
THE METHOD OF SEPARATING GAS MIXTURES BY LIQUEFACATION AND FRACTIONATION WHICH COMPRISES CHARGING THE MAJOR PROPORTION OF A GAS MIXTURE TO BE SEPARATED AT OPERATING PRESSURE TO COLD REGENERATORS OPERATED IN ALTERNATING CYCLES OF COLD STORING-CLEANSING AND GAS MIXTURE CHILLINGPURIFYING, A STREAM OF COLD PRODUCT GAS BEING USED FOR THE PURPOSE OF STORING COLD IN THE REGENERATORS AND CLEANING THEREFROM SOLIDIFIED DEPOSITS LAID DOWN DURING THE GAS CHILLING-PURIFYING STAGE OF THE CYCLE, THE QUANTITY OF SAID PRODUCT GAS STREAM BEING LARGER THAN THE QUANTITY OF SAID MAJOR PROPORTION, SIMULTANEOUSLY CHARGING THE REMAINING MINOR PROPORTION OF SAID GAS MIXTURE THROUGH EXTENDED-SURFACE HEAT EXCHANGING MEANS IN HEAT EXCHANGE WITH BOTH A SECOND STREAM OF COLD PRODUCT GAS AND A THIRD COLD GAS STREAM BEING LESS THAN THE QUANTITY PRODUCT GAS STREAM BEING LESS THAN THE QUANTITY OF SAID MINOR PROPORTION, EXCHANGING THE PATH OF SAID MINOR PROPORTION AND SAID SECOND PRODUCT GAS STREAM AT INTERVALS, PASSING SAID THIRD
Claim 2
Independent Claim
156 words
THE METHOD OF SEPARATING GAS MIXTURES BY LIQUEFACATION AND FRACTIONATION WHICH COMPRISES CHARGING THE MAJOR PROPORTION OF A GAS MIXTURE TO BE SEPARATED AT OPERATING PRESSURE TO COLD REGENERATORS OPERATED IN ALTERNATING CYCLES OF COLD STORING-CLEANSING AND GAS MIXTURE CHILLINGPURIFYING, A STREAM OF COLD PRODUCT GAS BEING USED FOR THE PURPOSE OF STORING COLD IN THE REGENERATORS AND CLEANING THEREFROM SOLIDIFIED DEPOSITS LAID DOWN DURING THE GAS CHILLING-PURIFYING STAGE OF THE CYCLE, THE QUANTITY OF SAID PRODUCT GAS STREAM BEING LARGER THAN THE QUANTITY OF SAID MAJOR PROPORTION, SIMULTANEOUSLY CHARGING THE REMAINING MINOR PROPORTION OF SAID GAS MIXTURE THROUGH EXTENDED-SURFACE HEAT EXCHANGING MEANS IN HEAT EXCHANGE WITH BOTH A SECOND STREAM OF COLD PRODUCT GAS AND A THIRD COLD GAS STREAM BEING LESS THAN THE QUANTITY PRODUCT GAS STREAM BEING LESS THAN THE QUANTITY OF SAID MINOR PROPORTION, EXCHANGING THE PATH OF SAID MINOR PROPORTION AND SAID SECOND PRODUCT GAS STREAM AT INTERVALS, PASSING SAID THIRD
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-29 | 1957-09-28 | 1958-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-29 | 1961-09-28 | 1962-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-29 | 1965-09-28 | 1966-03-30 | $7700.00 | Window Closed / Lapsed |