Patent US3780700A successfully refreshed from Google Patents.
US3780700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Template for thin layer chromatography samples
Assignee: Eastman Kodak Co
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Filing: 1971-10-14
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Granted: 1973-12-25
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Expires: 1991-10-14
Abstract
Abstract A template for holding a chromatographic sheet while permitting the application of a series of liquid samples rapidly, and on a well defined area of fixed size, comprises a base plate adapted to receive a chromatographic sheet on its surface, an applicator plate mating with the base plate and adapted to lie on top of the sheet, and means for clamping the parts together to hold the sheet in place. The applicator plate and the base plate are hinged together and provided with latches for clamping them together. To provide wells for receiving liquid samples, the applicator plate has a plurality of bores therethrough within which are pressed plastic bushings for engaging the chromatographic sheet without damaging its delicate surface. Also, two stop springs ease the movement of the applicator plate into register with the base plate so as to avoid damage to the chromatographic sheet. The base plate is provided with an abutment against which an edge of a chromatographic sheet is precisely positioned. The hinges are readily disengaged and reengaged to permit cleaning of the parts. Evaporation of solvent from the samples can be assisted by providing a suitable electrical heater in the base plate.
Inventors
- 👤 B Lafleur
- 👤 Brien R O
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:22
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/90; G01N30/91
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
109 words
Apparatus for applying liquid samples to a chromatographic sheet comprising, in combination, a base plate adapted to receive a chromatographic sheet on the surface thereof; an applicator plate hingedly mounted on said base plate for movement into and out of register with the top of said base plate, said applicator plate being adapted to lie on such a sheet and having a plurality of holes therethrough for receiving a plurality of liquid samples to spot said sheet; and said applicator plate comprising a bushing of resilient material in each of said holes and projecting therefrom in position to engage and to form a tight seal with such a sheet.
Claim 2
Dependent Claim
109 words
Apparatus for applying liquid samples to a chromatographic sheet comprising, in combination, a base plate adapted to receive a chromatographic sheet on the surface thereof; an applicator plate hingedly mounted on said base plate for movement into and out of register with the top of said base plate, said applicator plate being adapted to lie on such a sheet and having a plurality of holes therethrough for receiving a plurality of liquid samples to spot said sheet; and said applicator plate comprising a bushing of resilient material in each of said holes and projecting therefrom in position to engage and to form a tight seal with such a sheet.
Claim 3
Dependent Claim
33 words
Apparatus in accordance with claim 1 wherein said base plate has abutment means thereon adapted to engage an edge of such a chromatographic sheet to position such a sheet for receiving a sample.
Claim 4
Dependent Claim
46 words
Apparatus in accordance with claim 1, also comprising resilient stop means carried by one of said plates and adapted to engage the other of said plates during movement into register with one another, to arrest such movement and prevent harmful impact against such a chromatographic sheet.
Claim 5
Dependent Claim
45 words
Apparatus in accordance with claim 1 wherein said base plate and said applicator plate each has half hinge means thereon, said half hinge means being movable into and out of engagement with one another for detaching said applicator plate from said base plate at will.
Claim 6
Dependent Claim
75 words
Apparatus in accordance with claim 1 wherein said base plate has abutment means thereon adapted to engage an edge of such a chromatographic sheet to position such a sheet for receiving a sample; said apparatus also comprising resilient stop means carried by one of said plates and adapted to engage the other of said plates during movement into register with one another, to arrest such movement and prevent harmful impact against such a chromatographic sheet.
Claim 7
Dependent Claim
45 words
Apparatus in accordance with claim 5 wherein said base plate and said applicator plate each has half hinge means thereon, said half hinge means being movable into and out of engagement with one another for detaching said applicator plate from said base plate at will.
Claim 8
Dependent Claim
39 words
Apparatus in accordance with claim 2, wherein said holes arranged in a straight line parallel to said abutment means for applying a plurality of samples to such a chromatographic sheet along a straight line parallel to such edge thereof.
Claim 9
Dependent Claim
44 words
Apparatus in accordance with claim 1, also comprising latch means on one of said plates movable into and out of engagement with the other of said plates and acting to clamp a chromatographic sheet between said plates with said bushings engaging said chromatographic sheet.
Claim 10
Dependent Claim
73 words
Apparatus in accordance with claim 8 wherein said half hinge means on one of said plates comprises hinge pin means projecting laterally in one direction therefrom adjacent and parallel to an edge thereof, and wherein said half hinge means on the other of said plates comprises bearing means on said other oF said plates extending laterally thereof adjacent and parallel to an edge thereof and slideable on and off said hinge pin means.
References Cited (Backward Citations)
US2899928A
Cited
US1575564A
Cited
US2125457A
Cited
US2704992A
Cited
US3280794A
Cited
US3109641A
Cited
US3161543A
Cited
US3380434A
Cited
US3685916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |