US3629098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous flow, preparative thin-layer chromatograph
Assignee: TOYO ROSHI CO Ltd
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Filing: 1969-09-10
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Granted: 1971-12-21
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Expires: 1989-09-10
Abstract
Abstract An apparatus for thin-layer chromatography which comprises a support-coated glass plate, cover plates which are same in width as said glass plate and shorter in length than said glass plate and have spacers with same length on their both sides, clips for fitting said glass plate with said cover plate so that the latter plate can be moved up and down, and a solvent container with a lid into which the lower ends of both said glass and cover plates can be immersed.
Inventors
- 👤 Shoji Hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:52
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/90; G01N30/94
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
43 words
The apparatus of claim 1, wherein the means for maintaining said cover plate parallel to and apart from said coated support plate comprises spacers placed between and extending the length of the edges of said plates so as to minimize solvent vapor loss.
Claim 2
Dependent Claim
21 words
The apparatus of claim 2, wherein said means comprise spacers having a thickness of from about 1 to about 5 millimeters.
Claim 3
Dependent Claim
21 words
The apparatus of claim 2, wherein said means comprise spacers having a thickness of from about 2 to about 3 millimeters.
Claim 4
Dependent Claim
31 words
The apparatus of claim 1, wherein the porous medium disposed on the surface of said cover plate is selected from the group consisting of filter paper, glass fiber and fiber sheet.
Claim 5
Dependent Claim
16 words
The apparatus of claim 5, wherein said porous medium is impregnated with solvent prior to use.
Claim 6
Dependent Claim
21 words
The apparatus of claim 5, wherein said porous medium is retained adjacent to said cover plate by means of slender springs.
Claim 7
Dependent Claim
20 words
The apparatus of claim 1, wherein a movable heating means is disposed on the remote surface of said cover plate.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |