US3864263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromatographic plate device
Assignee: Wellcome Foundation Ltd
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Filing: 1973-04-11
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Granted: 1975-02-04
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Expires: 1993-04-11
Abstract
Abstract A device enabling the rapid and direct determination of Rf values in thin-layer chromatography consisting of a transparent plate in combination with a cursor; the cursor comprising a locating and a measuring portion having an Rf measuring scale.
Inventors
- 👤 Keshavlal Raghavji Jethwa
- 👤 Maurice Henry Bennie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:53
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/90; G01N30/95
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
161 words
A measuring device suitable for use in thin-layer chromatography which device comprises in combination a substantially transparent plate having two opposed side walls which elevate said plate above a plane surface when placed thereon, a base wall between the side walls to locate a chromatographic sheet when placed beneath the plate, relative to the plate, and a linear array of orifices in said plate adjacent and substantially parallel to the base wall; and a cursor comprising a measuring portion of substantially transparent material slidable on the plate and having a scale for the measurement of Rf values of chemical components in a chromatographic sheet when placed beneath the plate, a locating portion for sliding co-operation with an edge of the plate which lies parallel to the linear array of orifices to enable Rf values to be read and wherein the unit of length is greater than or equal to the length of the run on a chromatographic sheet when used therewith.
Claim 2
Dependent Claim
161 words
A measuring device suitable for use in thin-layer chromatography which device comprises in combination a substantially transparent plate having two opposed side walls which elevate said plate above a plane surface when placed thereon, a base wall between the side walls to locate a chromatographic sheet when placed beneath the plate, relative to the plate, and a linear array of orifices in said plate adjacent and substantially parallel to the base wall; and a cursor comprising a measuring portion of substantially transparent material slidable on the plate and having a scale for the measurement of Rf values of chemical components in a chromatographic sheet when placed beneath the plate, a locating portion for sliding co-operation with an edge of the plate which lies parallel to the linear array of orifices to enable Rf values to be read and wherein the unit of length is greater than or equal to the length of the run on a chromatographic sheet when used therewith.
Claim 3
Dependent Claim
43 words
A measuring device according to claim 1 wherein a portion of the plate is cut away at a corner adjacent to the base wall and a side wall thereby enabling access of the fingers to a chromatographic sheet when placed beneath the plate.
Claim 4
Dependent Claim
50 words
A measuring device according to claim 2 wherein the plate is provided with a slit having one long edge parallel to the linear array of orifices whereby a chromatographic sheet placed beneath the plate may be marked by a scriber passed through the slit and wherein the orifices are frustro-conical.
Claim 5
Dependent Claim
30 words
A measuring device according to claim 3 wherein the orifices have a diameter at the under surface of the plate greater than that at the upper surface of said plate.
Claim 6
Dependent Claim
44 words
A measuring device according to claim 4 wherein the measuring portion of the cursor is integral with the locating portion and the latter constitutes a lip for sliding co-operation with an edge of the plate which is parallel to the linear array of orifices.
Claim 7
Dependent Claim
50 words
A measuring device according to any of claim 1 wherein the measuring and locating portions of the cursor constitute two arms which are pivoted to each other whereby the measuring arm can be pivoted about an axis perpendicular to the plane of the plate when in use with said plate.
Claim 8
Dependent Claim
39 words
A measuring device according to claim 6 wherein the two arms are pivoted together at a point adjacent to one end of each of the arms and the two arms can be locked together at any angle between them.
Claim 9
Dependent Claim
105 words
A measuring device according to claim 7 wherein the locating arm comprises a member of substantially rigid material disposed in two planes substantially perpendicular to each other, and the measuring arm comprises a strip of substantially rigid and transparent material having a scale for the measurement of Rf values of chemical components and pivoted to the locating arm whereby the locating arM when placed on the plate sits thereon substantially coplanar with both the upper surface of the plate and the base wall, and the measuring arm lies upon and may be freely moved upon the upper surface of the plate about the pivot axis.
Claim 10
Dependent Claim
22 words
A measuring device according to claim 8 wherein the Rf measuring scale is an unit of length subdivided in a decimal system.
Claim 11
Dependent Claim
26 words
A measuring device according to claim 9 wherein the zero point of the Rf scale coincides with the pivot axis of the locating and measuring arms.
Claim 12
Dependent Claim
37 words
A measuring device according to claim 10 wherein the pivot axis of the locating and measuring arms, when the cursor functionally co-operates with the plate, bisects a line drawn between the centre of each of the orifices.
Claim 13
Dependent Claim
16 words
A measuring device according to claim 11 wherein said device is made from a plastics material.
Claim 14
Dependent Claim
15 words
A measuring device according to claim 12 wherein the plastics material is a polyacrylate material.
Claim 15
Dependent Claim
60 words
In a thin layer chromatographic measuring device, a cursor which comprises a locating arm comprising a member of substantially rigid material disposed in two planes substantially perpendicular to each other and a measuring arm pivoted to the locating arm and comprising a strip of substantially rigid and transparent material having a scale for measurement of Rf values of chemical components.
Claim 16
Dependent Claim
60 words
In a thin layer chromatographic measuring device, a cursor which comprises a locating arm comprising a member of substantially rigid material disposed in two planes substantially perpendicular to each other and a measuring arm pivoted to the locating arm and comprising a strip of substantially rigid and transparent material having a scale for measurement of Rf values of chemical components.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |