US3667607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromatographic material
Assignee: Avantor Performance Materials LLC
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Filing: 1970-11-27
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Granted: 1972-06-06
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Expires: 1990-11-27
Abstract
Abstract A thin layer chromatographic strip in the form of an elongated tape carrying indicia related to chromatographic test areas, the areas being in contact with a reservoir for solvent, the combination of test areas, indicia, and reservoir being periodically reproduced on the length of the tape, whereby the indicia may be used to initiate sampling, solvent application, and control passage through development and drying stages, and initiation and termination of scanning stages, thereby to make possible a sequence of unrelated or related analyses automatically on said tape.
Inventors
- 👤 Marcus K Brandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:43
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/90; G01N30/92; G01N35/00; G01N35/00009
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
18 words
A chromatographic adsorption element in accordance with claim 1 in which the substrate is a flexible plastic tape.
Claim 2
Dependent Claim
18 words
A chromatographic adsorption element in accordance with claim 1 in which the substrate is a monofilamentous fabric base.
Claim 3
Dependent Claim
29 words
A chromatographic adsorption element in accordance with claim 2 wherein a plurality of layers of chromatographic adsorbent material are arranged in parallel relationship on said flexible plastic tape substrate.
Claim 4
Dependent Claim
56 words
A chromatographic adsorption element in accordance with claim 1 wherein said layer of chromatographic adsorption material is selected from the group consisting of silica gel, alumina, cellulose, derivatized cellulose, microcrystalline cellulose, kieselguhr, ion-exchange resins, polyamide powders, hydroxapatite, diatomaceous earth, polysaccharide dextran derived powder, zinc carbonate, polyethylene powder, calcium sulfate, magnesium silicate, calcium hydroxide, and magnesia-silica gel.
Claim 5
Dependent Claim
39 words
A chromatographic adsorption element in accordance with claim 5 wherein said substrate is formed from a material selected from the group consisting of monofilamentous fabric of synthetic fiber, synthetic plastic, synthetic plastic-coated paper, synthetic plastic-coated fabric and metal foil.
Claim 6
Dependent Claim
37 words
A chromatographic adsorption element in accordance with claim 1 wherein the element is in the form of a reel of elongated tape having a sequence of chromatographic adsorptive material layers spaced along the length of the tape.
Claim 7
Dependent Claim
19 words
A chromatographic adsorption element of claim 2 wherein said indicia means comprises perforations spaced along the flexible plastic tape.
Claim 8
Dependent Claim
21 words
A chromatographic adsorption element in accordance with claim 2 wherein the indicia means comprises conductive spots spaced along the flexible tape.
Claim 9
Dependent Claim
22 words
A chromatographic adsorption element in accordance with claim 2 wherein the solvent reservoir comprises a pad of inert, open cellular structure material.
References Cited (Backward Citations)
US3553067A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |