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Patent US4955998A successfully refreshed from Google Patents.
US4955998A
Expired / Lapsed
US
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Process for separating gas
Assignee: Sumitomo Seika Chemicals Co Ltd
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Filing: 1989-10-20
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Granted: 1990-09-11
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Expires: 2009-10-20
Abstract
Abstract A process for separating a specific component from air which comprises alternately and repeatedly carrying out a step of feeding air under pressure to a non-porous gas separation membrane and suctioning of a permeating gas under vacuum after feeding of air is stopped.
Inventors
- 👤 Kanji Ueda
- 👤 Kazuo Haruna
- 👤 Masahiro Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:09
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
70 words
A process for separating a specific component from air by feeding air to a gas separation membrane module, which comprises the steps of: alternately and repeatedly feeding air under pressure to a non-porous gas separation membrane of a module selected from the group consisting of a plate-and-frame module, a spiral module and a hollow fiber module; and suctioning of a permeating gas under vacuum after feeding of air is stopped.
Claim 2
Dependent Claim
70 words
A process for separating a specific component from air by feeding air to a gas separation membrane module, which comprises the steps of: alternately and repeatedly feeding air under pressure to a non-porous gas separation membrane of a module selected from the group consisting of a plate-and-frame module, a spiral module and a hollow fiber module; and suctioning of a permeating gas under vacuum after feeding of air is stopped.
Claim 3
Dependent Claim
23 words
The process according to claim 1, wherein each step is repeatedly carried out at a cycle time of 2 seconds to 5 minutes.
Claim 4
Dependent Claim
17 words
The process according to claim 1, wherein one pump is commonly used for pressurization and pressure reduction.
Claim 5
Dependent Claim
17 words
The process according to claim 1, wherein different pumps are used for pressurization and pressure reduction, respectively.
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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) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |