US5141806A
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US
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Microporous structure with layered interstitial surface treatment, and method and apparatus for preparation thereof
Assignee: National Aeronautics and Space Administration
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Filing: 1989-10-31
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Granted: 1992-08-25
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Expires: 2009-10-31
Abstract
Abstract A microporous structure with layered interstitial surface treatments, and method and apparatus for preparation thereof. The structure is prepared by sequentially subjecting a uniformly surface-treated structure (10a) to atomic oxygen treatment to remove an outer layer (16) of surface treatment to a generally uniform depth, and then surface treating the so exposed layer with another surface treating agent. The atomic oxygen/surface treatment steps may optionally be repeated, each successive time to a lesser depth, to produce a microporous structure having multilayered surface treatments. The apparatus (200) employs at least one side arm (228) from a main atomic oxygen-containing chamber (202). The side arm (228) has characteristic relaxation times such that a uniform atomic oxygen dose rate is delivered to a specimen (239) positioned transversely in the side arm (228) spaced from the main gas chamber (202).
Inventors
- 👤 Steven L. Koontz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:53
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/009; A; A61; A61L; A61L27/00; A61L27/28; A61L33/00; A61L33/0076; A61L33/0094; B01D15/00; B01D15/08; B01D67/0093; B01D67/00931; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; B01J20/10; B01J20/103; B01J20/30; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3214; B01J20/3225; B01J20/3231; B01J20/3242; B01J20/3244; B01J20/3246; B01J20/3257; B01J20/3259; B01J20/3289; B01J20/3291; B01J20/3293; B01J37/00; B01J37/12; B01J37/14; B29; B29C; B29C59/00; B29C59/14; C; C12; C12N; C12N5/00; C12N5/0068; C12P; C12P21/00; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/53; G01N33/543; G01N33/544; G01N33/545; B29L; B29L2031/00; B29L2031/755; C12N2533/00; C12N2533/30; G01N30/00; G01N30/02; G01N30/50; G01N30/52; G01N2030/524; G01N2030/525; G01N2030/528; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249979; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
72 words
A microporous structure having a plurality of layers of interstitial surface treatments, comprising: a solid microporous structure having an exterior and an interior, said interior comprising an interstitial surface extending from said exterior; an outer layer of said interstitial surface adjacent to said exterior surface treated with a first surface treating agent; and an inner layer of said interstitial surface disposed from said exterior and treated with a second surface treating agent.
Claim 2
Dependent Claim
72 words
A microporous structure having a plurality of layers of interstitial surface treatments, comprising: a solid microporous structure having an exterior and an interior, said interior comprising an interstitial surface extending from said exterior; an outer layer of said interstitial surface adjacent to said exterior surface treated with a first surface treating agent; and an inner layer of said interstitial surface disposed from said exterior and treated with a second surface treating agent.
Claim 3
Dependent Claim
12 words
The structure of claim 1, wherein said structure comprises silica or alumina.
Claim 4
Dependent Claim
10 words
The structure of claim 1, wherein said structure is non-particulated.
Claim 5
Dependent Claim
20 words
The structure of claim 3, wherein said structure has the physical form of a cube, sheet, membrane, rod or tube.
Claim 6
Dependent Claim
29 words
The structure of claim 1, wherein said inner layer is disposed adjacent said outer layer in a bilayer configuration and said first and second surface treating agents are dissimilar.
Claim 7
Dependent Claim
30 words
The structure of claim 1, further comprising one or more layers intermediate said inner and outer layers wherein each layer has a different surface treatment than each layer adjacent thereto.
Claim 8
Dependent Claim
22 words
The structure of claim 6, wherein said microporous structure has an effective pore diameter of from about 1 to about 10,000 Å.
Claim 9
Dependent Claim
85 words
A porous silica structure with layered interstitial surface treatment, comprising: a solid microporous silica structure having an exterior and an interior, said interior comprising an interstitial surface underneath said exterior; an inner layer of said interstitial surface disposed from said exterior and treated with a first treating agent; an outer layer extending from adjacent said exterior toward said inner layer and treated with a second treating agent, said first and second treating agents being different than the surface treating agent in a layer adjacent thereto.
Claim 10
Dependent Claim
85 words
A porous silica structure with layered interstitial surface treatment, comprising: a solid microporous silica structure having an exterior and an interior, said interior comprising an interstitial surface underneath said exterior; an inner layer of said interstitial surface disposed from said exterior and treated with a first treating agent; an outer layer extending from adjacent said exterior toward said inner layer and treated with a second treating agent, said first and second treating agents being different than the surface treating agent in a layer adjacent thereto.
Claim 11
Dependent Claim
11 words
The silica structure of claim 8, wherein the silica is particulated.
Claim 12
Dependent Claim
22 words
The silica structure of claim 8, wherein the silica has an effective pore diameter of from about 1 to about 10,000 Å.
Claim 13
Dependent Claim
22 words
The silica structure of claim 9, wherein the silica has an effective pore diameter of from about 10 to about 1000 Å.
Claim 14
Dependent Claim
21 words
The silica structure of claim 9, wherein the silica has an effective pore diameter of from about 30 to 500 Å.
Claim 15
Dependent Claim
34 words
The silica structure of claim 8, wherein the structure includes one or more layers intermediate said inner and outer layers, each said intermediate layer having a different surface treatment than each layer adjacent thereto.
Claim 16
Dependent Claim
17 words
The silica structure of claim 8, wherein the silica is adapted for chromatographic separation column packing material.
Claim 17
Dependent Claim
27 words
The silica structure of claim 14, wherein said outer layer is surface treated to inhibit protein adsorption thereon, and said inner layer has an isolate-selective surface treatment.
Claim 18
Dependent Claim
28 words
The silica structure of claim 8, wherein the structure includes a transition zone between said layers, said transition zone having a thickness of about one effective pore diameter.
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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) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |