Patent US3500919A successfully refreshed from Google Patents.
US3609983A
Expired / Lapsed
US
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Krypton-xenon recovery system and process
Assignee: Airco Inc
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Filing: 1968-05-16
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Granted: 1971-10-05
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Expires: 1988-05-16
Abstract
Abstract A KRYPTON-XENON MIXTURE IS RECOVERED FROM THE OXYGEN STREAM OF AN AIR SEPARATION PLANT IN A GRAVITY FLOW TWOSTAGE DISTILLATION PROCESS. HYDROCARBON CONTAMINANTS ARE REMOVED BY ADSORPTION AND CATALYTIC COMBUSTION, THE RESULTANT WATER AND CARBON DIOXIDE BEING FROZEN OUT IN HEAT EXCHANGERS. THE FINAL KRYPTON-XENON PRODUCT INCLUDES ABOUT 1 PERCENT OXYGEN AND ABOUT 0.15 PERCENT HYDROCARBON IMPURITY.
Inventors
- 👤 Antony Lofredo
- 👤 Francis J Daly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:34
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04642; F25J3/04745; F25J3/04751; F25J3/04757; F25J2200/00; F25J2200/34; F25J2205/00; F25J2205/24; F25J2205/60; F25J2205/82; F25J2220/00; F25J2220/52; Y; Y10; Y10S; Y10S62/00; Y10S62/923; Y10S62/925
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |