US2990689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the production of argon
Assignee: INDEPENDENT ENGINEERING COMPAN
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Filing: 1954-11-19
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Granted: 1961-07-04
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Expires: 1974-11-19
Abstract
No abstract record available.
Inventors
- 👤 Herman A Lorenz
- 👤 Russell H Classen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:06
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04248; F25J3/04278; C; C01; C01B; C01B23/00; F25J3/04642; F25J3/04648; F25J3/04721; F25J3/04733; F25J3/04739; F25J3/04763; F25J3/04866; F25J3/04951; F25J3/04963; F25J2205/00; F25J2205/60; F25J2205/82; F25J2230/00; F25J2230/58; F25J2270/00; F25J2270/42; Y; Y10; Y10S; Y10S62/00; Y10S62/915; Y10S62/923; Y10S62/924
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
120 words
IN A SYSTEM FOR THE PURIFICATION OF CRUDE ARGON, HEAT EXCHANGE MEANS, RECTIFICATION COLUMN MEANS FOR SEPARATING PURE ARGON IN LIQUID FORM FROM THE BOTTOM AND WASTE GAS FROM THE TOP OF SAID COLUMN, MEANS FOR PASSING CRUDE ARGON THROUGH SAID HEAT EXCHANGE MEANS TO COOL THE SAME AND SUBSEQUENTLY INTO SAID RECTIFICATION COLUMN, MEANS FOR PASSING PURE ARGON IN HEAT EXCHANGE RELATION WITH A NITROGEN REFRIGERANT AND SUBSEQUENTLY THROUGH SAID HEAT EXCHANGE MEANS, AND MEANS FOR PASSING THE NITROGEN REFRIGERANT THROUGH SAID HEAT EXCHANGE MEANS, SAID LAST NAMED MEANS INCLUDING MEANS FOR EXPANDING A HIGH PRESSURE NITROGEN STREAM TO A LOW PRESSURE AT WHICH THE BOILING POINT OF NITROGEN IS ABOUT THE TEMPERATURE OF THE FREEZING POINT OF ARGON.
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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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |