US4248904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing samples for application to a thin layer chromatographic sheet
Assignee: Individual
•
Filing: 1979-05-21
•
Granted: 1981-02-03
•
Expires: 1999-05-21
Abstract
Abstract A chemically inert, non-absorptive applicator sheet, a depression defined by a recessed portion of the applicator sheet, a transfer coating on at least a portion of a top surface of the applicator sheet, means for evaporating a solution of sample and carrier solvent deposited on the transfer coating, and a displacement mechanism for displacing a sample formed in the recess are disclosed. The depression in the applicator sheet may be formed by imposing a suction beneath the applicator sheet; and a displacement of a sample formed in the depression may be accomplished by introducing pressure beneath the applicator sheet.
Inventors
- 👤 David C. Fenimore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 22:00
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/90; G01N30/91
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
59 words
Method for applying samples to a thin-layer chromatographic sheet comprising the steps of: providing a chemically inert, non-absorptive applicator plate; introducing a solution of a sample and a solvent into a depressed portion of the applicator plate; evaporating the solvent to provide a speck of sample on the transfer liquid; and transferring the speck to a thin-layer chromatographic sheet.
Claim 2
Dependent Claim
59 words
Method for applying samples to a thin-layer chromatographic sheet comprising the steps of: providing a chemically inert, non-absorptive applicator plate; introducing a solution of a sample and a solvent into a depressed portion of the applicator plate; evaporating the solvent to provide a speck of sample on the transfer liquid; and transferring the speck to a thin-layer chromatographic sheet.
Claim 3
Dependent Claim
34 words
The method of claim 1 and further including a step of coating at least a portion of the applicator plate with a layer of transfer fluid prior to introduction of said sample and solvent.
Claim 4
Dependent Claim
22 words
The method of claim 1 and further including a step of forming said depression on a top surface of the applicator plate.
Claim 5
Dependent Claim
41 words
The method of claim 3 wherein said forming step comprises introducing a suction source at a location on a bottom surface of the applicator plate to displace a portion of the applicator plate adjacent the suction source towards the suction source.
Claim 6
Dependent Claim
18 words
The method of claim 3 wherein said forming step comprises molding a cup-like depression in the applicator plate.
Claim 7
Dependent Claim
21 words
The method of claim 2 wherein said coating step includes coating the applicator plate with a layer of polyfluorinated transfer fluid.
Claim 8
Dependent Claim
24 words
The method of claim 1 wherein said introducing step comprises forming said depression in the applicator plate and introducing the solution into the depression.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein said evaporating step comprises heating the applicator plate.
Claim 10
Dependent Claim
25 words
The method of claim 1 wherein said transferring step includes bringing the thin-layer chromotographic sheet into direct contact with the transfer fluid and the speck.
References Cited (Backward Citations)
FR424226A
Cited
GB461244A
Cited
US2066130A
Cited
GB472796A
Cited
US2124711A
Cited
US2284491A
Cited
US2647337A
Cited
GB1161534A
Cited
US4011350A
Cited
US3757952A
Cited
US3868901A
Cited
US3871293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |