US3144313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Difusion purification of gases
Assignee: Engelhard Industries Inc
•
Filing: 1960-04-01
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Granted: 1964-08-11
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Expires: 1980-04-01
Abstract
No abstract record available.
Inventors
- 👤 William C Pfefferle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:47
CPC Classifications
C; C01; C01B; C01B23/00; B; B01; B01D; B01D53/00; B01D53/22; B01D53/228; C01B3/00; C01B3/50; C01B3/501; C01B2203/00; C01B2203/04; C01B2203/0405; C01B2203/0465; C01B2203/048
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
A METHOD FOR SEPARATING A SELECTED GAS CNSTITUENT FROM A GAS ISTURE, WHICH COMPRISES PASSING THE GAS MIXTURE THROUGH ANINPUT ZONE OF A DIFFUSION UNIT IN A PREDETERMINED DIRECTION WITH RESPECT TO A NON-POROUS DIFFUSION MEMBRANE, THE SELECTED GAS CONSTITUENT DIFFUSION THROUGH THE LATTICE OF THE MATERIAL OF THE MEMBRANE INTO A RECOVERY ZONE AT TH EOTHER SIDE OF THE MEMBRANE, WITHDRAWING THE GAS HAVING A LOWER CONTENT OF THE SELECTED GAS
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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) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |