US3222878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for fractionation of air
Assignee: Linde GmbH
•
Filing: 1963-12-12
•
Granted: 1965-12-14
•
Expires: 1983-12-12
Abstract
No abstract record available.
Inventors
- 👤 Becker Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:30
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04006; F25J3/04078; F25J3/0409; F25J3/04248; F25J3/04284; F25J3/0429; F25J3/04303; F25J3/04333; F25J3/04369; F25J3/044; F25J3/04406; F25J3/04412; F25J3/04642; F25J3/04648; F25J3/04654; F25J3/0466; F25J3/04666; F25J3/04721; F25J2200/00; F25J2200/70; F25J2200/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
IN A PROCESS FOR PRODUCING OXYGEN BY LOW TEMPERATURE FRACTINATION, WHICH COMPRISES THE AFTER-FRACTIONATION STEPS OF WITHDRAWING LIQUID OXYGEN FROM A FRACTIONATION COLUMN, COMPRESSING SAID LIQUID OXYGENM AND VAPORIZING THE RESULTANT COMPRESSED LIQUID OXYGEN IN INDIRECT HEAT TRANSFER RELATIONSHIP WITH A COMPRESSED CIRCULATION GAS, THE IMPROVEMENT WHICH COMPRISES EMPLOYING AS SAID GAS, A GASEOUS MIXTURE OF 8-30 MOL PERCENT OXYGEN, NOT MORE THAN 10 MOL PERCENT NITROGEN, AND THE REMAIN-
Claim 2
Dependent Claim
70 words
IN A PROCESS FOR PRODUCING OXYGEN BY LOW TEMPERATURE FRACTINATION, WHICH COMPRISES THE AFTER-FRACTIONATION STEPS OF WITHDRAWING LIQUID OXYGEN FROM A FRACTIONATION COLUMN, COMPRESSING SAID LIQUID OXYGENM AND VAPORIZING THE RESULTANT COMPRESSED LIQUID OXYGEN IN INDIRECT HEAT TRANSFER RELATIONSHIP WITH A COMPRESSED CIRCULATION GAS, THE IMPROVEMENT WHICH COMPRISES EMPLOYING AS SAID GAS, A GASEOUS MIXTURE OF 8-30 MOL PERCENT OXYGEN, NOT MORE THAN 10 MOL PERCENT NITROGEN, AND THE REMAIN-
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US2095809A
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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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |