US3197970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the purification of hydrogen
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1963-04-16
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Granted: 1965-08-03
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Expires: 1983-04-16
Abstract
No abstract record available.
Inventors
- 👤 Nelson Warren Leonard
- 👤 Salama Claude
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:03
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0228; F25J3/0252; F25J3/0204; F25J3/0219; F25J3/0233; F25J2200/00; F25J2200/74; F25J2205/00; F25J2205/02; F25J2205/04; F25J2205/24; F25J2205/30; F25J2205/50; F25J2210/00; F25J2210/12; F25J2215/00; F25J2215/10; F25J2235/00; F25J2235/60; F25J2270/00; F25J2270/02; F25J2270/12; F25J2270/42; F25J2270/88; Y; Y10; Y10S; Y10S62/00; Y10S62/931; Y10S62/932
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A METHOD FOR THE ELIMINATION OF NORMALLY GASEOUS IMPURITIES FROM IMPURE HYDROGEN, COMPRISING: (A) WASHING IMPURE HYDROGEN IN A WASH ZONE AT A LOW TEMPERATURE WITH A LIQUID HYDROCARBON LESS VOLATILE THAN METHANE, THEREBY TO PRODUCE RELATIVELY PURE HYDROGEN AND IMPURITY-LADEN LIQUID HYDROCARBON AT A FIRST PRESSURE, (B) RECTIFYING SAID IMPURITY-LADEN LIQUID HYDROCARBON IN A RECTIFYING ZONE AT A SECOND PRESSURE LOWER THAN SAID FIRST PRESSURE, THEREBY PRODUCING IMPURITY-RICH VAPORS AND REGENERATED LIQUID HYDROCARBON, (C) EXPANDING A PORTION OF REGENERATED LIQUID HYDROCARBON TO A THIRD PRESSURE LOWER THAN SAID SECOND PRESSURE,
Claim 2
Independent Claim
91 words
A METHOD FOR THE ELIMINATION OF NORMALLY GASEOUS IMPURITIES FROM IMPURE HYDROGEN, COMPRISING: (A) WASHING IMPURE HYDROGEN IN A WASH ZONE AT A LOW TEMPERATURE WITH A LIQUID HYDROCARBON LESS VOLATILE THAN METHANE, THEREBY TO PRODUCE RELATIVELY PURE HYDROGEN AND IMPURITY-LADEN LIQUID HYDROCARBON AT A FIRST PRESSURE, (B) RECTIFYING SAID IMPURITY-LADEN LIQUID HYDROCARBON IN A RECTIFYING ZONE AT A SECOND PRESSURE LOWER THAN SAID FIRST PRESSURE, THEREBY PRODUCING IMPURITY-RICH VAPORS AND REGENERATED LIQUID HYDROCARBON, (C) EXPANDING A PORTION OF REGENERATED LIQUID HYDROCARBON TO A THIRD PRESSURE LOWER THAN SAID SECOND PRESSURE,
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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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |