Patent US3172741A successfully refreshed from Google Patents.
US3172741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of gases by diffusion
Assignee: —
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Filing: —
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Granted: 1965-03-09
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Expires: 1982-03-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:21
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A PROCESS FOR SEPARATING GASES WHICH COMPRISES A STEP OF BRINGING A GAS MIXTURE CONTAINING ONE GAS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND HELIUM AND AT LEAST ONE OTHER GAS INTO CONTACT WITH ONE SIDE OF A MEMBRANE FORMED FROM A FILM-FORMING POLYMERIC MATERIAL, THE POLYMERIC MATERIAL COMPRISING A POLYMER IN WHICH EVERY REPEATING UNIT CONTAINS A GROUP HAVING A DIPOLE MOMENT OF AT LEAST 2.5 DEBYE UNITS, AND SELECTED FROM THE GROUP CONSISTING OF POLYACRYLONITRILE AND A POLYMER WHEREIN EVERY REPEATING UNIT CONTAINS THE SUBSTITUENT =O PENDANT FROM A CARBON ATOMS WHICH FORMS A PART OF THE MAIN CHAIN OF SAID POLYMER, PERMEATING A PORTION OF SAID GAS MIXTURE THROUGH THE MEMBRANE, SAID PORTION HAVING A GREATER CONCENTRATION OF SAID ONE GAS THAN THE ORIGINAL GAS MIXTURE; AND REMOVING THE PERMEATED GAS FROM THE OPPOSITE SIDE OF SAID MEMBRANE.
Claim 2
Dependent Claim
142 words
A PROCESS FOR SEPARATING GASES WHICH COMPRISES A STEP OF BRINGING A GAS MIXTURE CONTAINING ONE GAS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND HELIUM AND AT LEAST ONE OTHER GAS INTO CONTACT WITH ONE SIDE OF A MEMBRANE FORMED FROM A FILM-FORMING POLYMERIC MATERIAL, THE POLYMERIC MATERIAL COMPRISING A POLYMER IN WHICH EVERY REPEATING UNIT CONTAINS A GROUP HAVING A DIPOLE MOMENT OF AT LEAST 2.5 DEBYE UNITS, AND SELECTED FROM THE GROUP CONSISTING OF POLYACRYLONITRILE AND A POLYMER WHEREIN EVERY REPEATING UNIT CONTAINS THE SUBSTITUENT =O PENDANT FROM A CARBON ATOMS WHICH FORMS A PART OF THE MAIN CHAIN OF SAID POLYMER, PERMEATING A PORTION OF SAID GAS MIXTURE THROUGH THE MEMBRANE, SAID PORTION HAVING A GREATER CONCENTRATION OF SAID ONE GAS THAN THE ORIGINAL GAS MIXTURE; AND REMOVING THE PERMEATED GAS FROM THE OPPOSITE SIDE OF SAID MEMBRANE.
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) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |