US3241293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion purification of gases
Assignee: Individual
•
Filing: 1962-08-24
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Granted: 1966-03-22
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Expires: 1982-08-24
Abstract
No abstract record available.
Inventors
- 👤 William C Pfefferle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:21
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/50; C01B3/501; C01B3/503; C01B3/505; B; B01; B01D; B01D53/00; B01D53/22; B01D63/00; B01D63/06; C01B2203/00; C01B2203/04; C01B2203/0405
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
A PROCESS FOR SEPARATING HYDROGEN FROM A MIXTURE OF GASES CONTAINING HYDROGEN WHICH COMPRISES PASSING SAID MIXTURE AT AN ELEVATED PRESSURE OF FROM ABOUT 2 TO ABOUT 100 ATMOSPHERES INTO THE INPUT CHAMBER OF A DIFFUSION UNIT HAVING AN INPUT CHAMBER AND A RECOVERY CHAMBER SEPARATED BY A THIN NON-POROUS DIFFUSION FOIL UNSUPPORTED EXCEPT AT THE PERIPHERY THEROF AND SELECTIVELY PERMEABLE TO HYDROGEN, SAID FOIL BEING BETWEEN 0.1 AND ABOUT 1 MIL THICKNESS, AND HAVING A SURFACE AREA OF AT LEAST ABOUT 5 SQUARE INCHES, PASSING A SWEEP GAS THROUGH SAID RECOVERY CHAMBER, MAINTAINING THE PRESSURE IN SAID RECOVERY CHAMBER SUBSTANTIALLY EQUAL TO THE PRESSURE IN SAID INPUT CHAMBER TO PROVIDE A PRESSURE DIFFERENTIAL ACROSS SAID FOIL BELOW 10 P.S.I. AND LESS THAN THE RUPTURE PRESSURE OF SAID FOIL, MAINTAINING THE PARTIAL PRESSURE OF HYDROGEN IN SAID RECOVERY CHAMBER BELOW THE PARTIAL PRESSURE OF HYDROGEN IN SAID INPUT CHAMBER, WITHDRAWING DIFFUSED HYDROGEN IN ADMIXTURE WITH SAID SWEEP GAS FROM THE RECOVERY CHAMBER, AND WITHDRAWING NONDIFFUSED COMPONENT OF SAID MIXTURE FROM THE INPUT CHAMBER.
Claim 2
Dependent Claim
173 words
A PROCESS FOR SEPARATING HYDROGEN FROM A MIXTURE OF GASES CONTAINING HYDROGEN WHICH COMPRISES PASSING SAID MIXTURE AT AN ELEVATED PRESSURE OF FROM ABOUT 2 TO ABOUT 100 ATMOSPHERES INTO THE INPUT CHAMBER OF A DIFFUSION UNIT HAVING AN INPUT CHAMBER AND A RECOVERY CHAMBER SEPARATED BY A THIN NON-POROUS DIFFUSION FOIL UNSUPPORTED EXCEPT AT THE PERIPHERY THEROF AND SELECTIVELY PERMEABLE TO HYDROGEN, SAID FOIL BEING BETWEEN 0.1 AND ABOUT 1 MIL THICKNESS, AND HAVING A SURFACE AREA OF AT LEAST ABOUT 5 SQUARE INCHES, PASSING A SWEEP GAS THROUGH SAID RECOVERY CHAMBER, MAINTAINING THE PRESSURE IN SAID RECOVERY CHAMBER SUBSTANTIALLY EQUAL TO THE PRESSURE IN SAID INPUT CHAMBER TO PROVIDE A PRESSURE DIFFERENTIAL ACROSS SAID FOIL BELOW 10 P.S.I. AND LESS THAN THE RUPTURE PRESSURE OF SAID FOIL, MAINTAINING THE PARTIAL PRESSURE OF HYDROGEN IN SAID RECOVERY CHAMBER BELOW THE PARTIAL PRESSURE OF HYDROGEN IN SAID INPUT CHAMBER, WITHDRAWING DIFFUSED HYDROGEN IN ADMIXTURE WITH SAID SWEEP GAS FROM THE RECOVERY CHAMBER, AND WITHDRAWING NONDIFFUSED COMPONENT OF SAID MIXTURE FROM THE INPUT CHAMBER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |