US3854913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of neon and helium from air by adsorption and closed cycle helium refrigeration
Assignee: PHYSICHESKI INST ANEB PRI BAN BG
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Filing: 1972-01-27
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Granted: 1974-12-17
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Expires: 1992-01-27
Abstract
Abstract A method and installation for the separation of neon and helium mixtures in which the neon is condensed from the mixture at a temperature below 25*K, the uncondensed neon is adsorbed from the mixture at a temperature between 22*K and the critical-point temperature of helium, and a helium-cooling cycle is used to abstract heat from the mixture.
Inventors
- 👤 E Leyarovski
- 👤 B Nicolov
- 👤 Y Gueorguiev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:20
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04642; F25J3/06; F25J3/063; F25J3/0685; F25J3/069; F25J3/08; F25J2205/00; F25J2205/02; F25J2205/04; F25J2205/20; F25J2205/24; F25J2205/40; F25J2205/60; F25J2210/00; F25J2210/42; F25J2215/00; F25J2215/04; F25J2215/30; F25J2215/32; F25J2270/00; F25J2270/14; F25J2270/30; F25J2270/90; F25J2270/904; Y; Y10; Y10S; Y10S62/00; Y10S62/923
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
151 words
A METHOD OF SEPARATING NEON FROM HELIUM IN A NEON HELIUM MIXTURE AND PRODUCING PURE NEON AND HELIUM, COMPRISING THE STEPS OF: A. COOLING SAID NEON-HELIUM MIXTURE BY HEAT EXCHANGE WITH COLD HELIUM FORMED IN A CLOSED HELIUM-CIRCULATING BYCYCLE BY EXPANSION OF HELIUM TO A TEMPERATURE BELOW SUBSTANTIALLY 25*K TO CONDENSE NEON FROM SAID MIXTURE AND PRODUCE A NONCONDENSED GAS CONSISTING PREDOMINANTLY OF HELIUM BUT CONTAINING RESIDUAL ENON; B. AFSORBING NEON FROM SAID NONCONDENSED GAS IN A MOLECULAR SIEVE ADSROBER AT A TEMPERATURE BETWEEN 5.2*K AND 22*K TO REMOVE SAID RESIDUAL NEON; C. DESORBING NEON FROM SAID ADSORBER UNDER VACUUM WHILE COOLING AT A TEMPERATYRE BELOW 22*K SAID GAS TO SAID TEMPERATURE BETWEN 22*K AND THE CRITICAL TEMPERATURE POINT OF HELIUM AT LEAST IN PART BY ABSTRACTING FROM SAID GAS ALL OF THE LATENT HEAT OF DESORPTION OF THE NEON, SAID MIXTURE PRIOR TO STEP 8A) CONTAINING AT LEAST ONE HIGH-
Claim 2
Independent Claim
151 words
A METHOD OF SEPARATING NEON FROM HELIUM IN A NEON HELIUM MIXTURE AND PRODUCING PURE NEON AND HELIUM, COMPRISING THE STEPS OF: A. COOLING SAID NEON-HELIUM MIXTURE BY HEAT EXCHANGE WITH COLD HELIUM FORMED IN A CLOSED HELIUM-CIRCULATING BYCYCLE BY EXPANSION OF HELIUM TO A TEMPERATURE BELOW SUBSTANTIALLY 25*K TO CONDENSE NEON FROM SAID MIXTURE AND PRODUCE A NONCONDENSED GAS CONSISTING PREDOMINANTLY OF HELIUM BUT CONTAINING RESIDUAL ENON; B. AFSORBING NEON FROM SAID NONCONDENSED GAS IN A MOLECULAR SIEVE ADSROBER AT A TEMPERATURE BETWEEN 5.2*K AND 22*K TO REMOVE SAID RESIDUAL NEON; C. DESORBING NEON FROM SAID ADSORBER UNDER VACUUM WHILE COOLING AT A TEMPERATYRE BELOW 22*K SAID GAS TO SAID TEMPERATURE BETWEN 22*K AND THE CRITICAL TEMPERATURE POINT OF HELIUM AT LEAST IN PART BY ABSTRACTING FROM SAID GAS ALL OF THE LATENT HEAT OF DESORPTION OF THE NEON, SAID MIXTURE PRIOR TO STEP 8A) CONTAINING AT LEAST ONE HIGH-
Claim 3
Dependent Claim
28 words
The method defined in claim 1 wherein steps (a) and (b) are carried out at substantially the pressure at which said mixture is received from a source thereof.
References Cited (Backward Citations)
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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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |