US3780496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonated polyxylene oxide as a permselective membrane for gas separations
Assignee: General Electric Co
•
Filing: 1972-07-31
•
Granted: 1973-12-25
•
Expires: 1992-07-31
Abstract
Abstract Sulfonated polyxylylene oxide membranes are very effective for the separation of helium, hydrogen and oxygen from gas mixtures. The discovery that the permeability of the aforementioned gases varies with the counter ion form of the sulfonated polyxylylene oxide membrane used is also disclosed.
Inventors
- 👤 W Ward
- 👤 R Salemme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:21
CPC Classifications
C; C01; C01B; C01B23/00; C01B23/001; C01B23/0036; C01B23/0042; C01B23/0047; B; B01; B01D; B01D53/00; B01D53/22; B01D53/228; C01B13/00; C01B13/02; C01B13/0229; C01B13/0248; C01B13/0251; C01B13/0255; C01B3/00; C01B3/50; C01B3/501; C01B3/503; C01B2203/00; C01B2203/04; C01B2203/0405; C01B2203/0465; C01B2203/047; C01B2203/048; C01B2210/00; C01B2210/0029; C01B2210/0031; C01B2210/0043; C01B2210/0068
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
31 words
The method recited in claim 1 wherein the form of the sulfonated polyxylylene oxide counter ion is selected from the group consisting of a transition metal ion and the stannic ion.
Claim 2
Dependent Claim
39 words
The method of claim 1 wherein oxygen is separated from pressurized air brought to the one side of the membrane and is added to air at atmospheric pressure on the opposite side thereof to produce an oxygen-enriched air flow.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein hydrogen is separated from a hydrogen/hydrocarbon gas mixture.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein hydrogen is separated from a gas mixture containing hydrogen and carbon monoxide.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein helium is separated from natural gas.
Claim 6
Dependent Claim
16 words
The method of claim 6 wherein the natural gas is predominantly methane and other hydrocarbon gases.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |