Patent US4261835A successfully refreshed from Google Patents.
US4261835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin layer and paper chromatography cones
Assignee: Individual
•
Filing: 1979-04-27
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Granted: 1981-04-14
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Expires: 1999-04-27
Abstract
Abstract This is an invention of paper chromatography and thin layer chromatography "baw-rar" (where "baw-rar" is Hebrew for separate) cones, hereon called PC and TLC cones, and other geometric shapes whose horizontal cross sections generally decrease in area as they are taken further from the base, with the adsorbent or absorbent layer decreasing in thickness from the base to the apex, to be used in PC and TLC work to reduce the horizontal and vertical spreading and diffusing of the developed spots. These will, for example, provide more easily and definitively determinable R f values, eliminate scraping of relatively large areas when scraping is necessary and increase the sensitivity of PC and TLC. The methods of use of the new PC and TLC cones are also disclosed herein.
Inventors
- 👤 Samuel M. Creeger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:30
CPC Classifications
B; B01; B01D; B01D15/00; B01D15/08; G; G01; G01N; G01N30/00; G01N30/90; G01N30/92; G01N30/02; G01N30/50; G01N30/52; G01N2030/524; G01N2030/528; G01N30/60; G01N30/6052; G01N30/6065
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
50 words
A chromatography separation apparatus comprising a member having an apex, with the area of the horizontal cross-section generally decreasing toward the apex, said member being constructed of a material including silica gel and said member selected from the group consisting of at least part of a cone, hemisphere or paraboloid.
Claim 2
Dependent Claim
50 words
A chromatography separation apparatus comprising a member having an apex, with the area of the horizontal cross-section generally decreasing toward the apex, said member being constructed of a material including silica gel and said member selected from the group consisting of at least part of a cone, hemisphere or paraboloid.
Claim 3
Dependent Claim
18 words
the chromatography separation apparatus of claim 1 wherein the thickness of the material generally decreases toward the apex.
Claim 4
Dependent Claim
15 words
The chromatography separation apparatus of claim 1 wherein the thickness of the material is uniform.
Claim 5
Dependent Claim
34 words
The chromatography separation apparatus of claim 1 where the material going in the direction from base to apex is composed of bands of materials of different properties which affect the rate of solvent flow.
Claim 6
Dependent Claim
14 words
The chromatography separation apparatus of claim 1 wherein the said member is a shell.
Claim 7
Dependent Claim
63 words
A chromatography separation apparatus comprising a member having an apex with the area of the horizontal cross-section generally decreasing toward the apex, said member being constructed of a material including an adsorbent or absorbent and said member selected from the group consisting of at least part of a cone, hemisphere or paraboloid, wherein the thickness of the material generally decreases toward the apex.
Claim 8
Dependent Claim
63 words
A chromatography separation apparatus comprising a member having an apex with the area of the horizontal cross-section generally decreasing toward the apex, said member being constructed of a material including an adsorbent or absorbent and said member selected from the group consisting of at least part of a cone, hemisphere or paraboloid, wherein the thickness of the material generally decreases toward the apex.
Claim 9
Dependent Claim
12 words
The chromatography separation apparatus of claim 6 where the material comprises paper.
Claim 10
Dependent Claim
35 words
The chromatography separation apparatus of claim 6 where the said material, going in the direction from base to apex, is composed of bands of materials of different properties which affect the rate of solvent flow.
Claim 11
Dependent Claim
54 words
A chromatographic method of separating components of a material comprising: (1) application of a liquid containing said componets to a member having an apex, with a generally decreasing horizontal cross-section toward the apex, wherein said member comprises paper, and (2) developing the member by inserting it in a solvent such that the componets separate.
Claim 12
Dependent Claim
54 words
A chromatographic method of separating components of a material comprising: (1) application of a liquid containing said componets to a member having an apex, with a generally decreasing horizontal cross-section toward the apex, wherein said member comprises paper, and (2) developing the member by inserting it in a solvent such that the componets separate.
Claim 13
Dependent Claim
12 words
The chromatographic method of claim 9 wherein said member is a shell.
Claim 14
Dependent Claim
31 words
The chromatographic method of claim 9 whereby the member containing the componets at some degree of separation is cut or scraped to remove the part of the member containing the componet.
Claim 15
Dependent Claim
57 words
A chromatographic method of separating componets of a material comprising: (1) application of a liquid containing said componets to a member having an apex, with a generally decreasing horizontal cross-section toward the apex, wherein said member is coated with an adsorbent, and (2) developing the member by inserting it in a solvent such that the componets separate.
Claim 16
Dependent Claim
57 words
A chromatographic method of separating componets of a material comprising: (1) application of a liquid containing said componets to a member having an apex, with a generally decreasing horizontal cross-section toward the apex, wherein said member is coated with an adsorbent, and (2) developing the member by inserting it in a solvent such that the componets separate.
Claim 17
Dependent Claim
19 words
The chromatographic method of claim 12, wherein the said member is coated with an adsorbent at a uniform thickness.
Claim 18
Dependent Claim
12 words
The chromatographic method of claim 12, wherein said member is a shell.
Claim 19
Dependent Claim
31 words
The chromatographic method of claim 12, whereby the member containing the componets at some degree of separation is cut or scraped to remove the part of the member containing the componet.
Claim 20
Dependent Claim
23 words
The chromatographic method of claim 12, wherein the said member is coated with an adsorbent of a thickness generally decreasing toward the apex.
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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) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |