US4157299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-phase filter and thin layer chromatography process
Assignee: United States Department of the Army
•
Filing: 1976-01-22
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Granted: 1979-06-05
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Expires: 1996-01-22
Abstract
Abstract A process of using a two-phase gas or liquid filter and thin layer chromatography member having a filter portion and a chromatography portion. The sample is collected and analyzed on the same member. A developing solvent of substantially acrylonitrile-benzene-petroleum ether is used to allow the sample to chromatograph on the chromatography portion of the member.
Inventors
- 👤 Robert A. Landowne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:55
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/90; G01N30/94; G01N30/92
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
73 words
A method for detecting filterable materials in gases or liquids which comprises the steps of collecting a gas or liquid sample on the unteated portion of a medium consisting of a support material having from about 75% to about 90% of its surface area continuously treated with an absorbent, contacting the collected sample with a developing solvent of substantial acrylonitrile-benzene-petroleum ether mixture, allowing the sample to chromatograph, and analyzing the resultant developed chromatogram.
Claim 2
Independent Claim
73 words
A method for detecting filterable materials in gases or liquids which comprises the steps of collecting a gas or liquid sample on the unteated portion of a medium consisting of a support material having from about 75% to about 90% of its surface area continuously treated with an absorbent, contacting the collected sample with a developing solvent of substantial acrylonitrile-benzene-petroleum ether mixture, allowing the sample to chromatograph, and analyzing the resultant developed chromatogram.
Claim 3
Dependent Claim
12 words
A method according to claim 1 wherein said support material is fiberglass.
Claim 4
Dependent Claim
12 words
A method according to claim 1 wherein said adsorbent is silica gel.
Claim 5
Dependent Claim
18 words
A method according to claim 1 wherein said support material is fiberglass and said adsorbent is silica gel.
References Cited (Backward Citations)
US875355A
Cited
US2890797A
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US3510263A
Cited
US3647684A
Cited
US3552295A
Cited
US3600306A
Cited
US3893808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-04 | 1982-12-04 | 1983-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-04 | 1986-12-04 | 1987-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-04 | 1990-12-04 | 1991-06-05 | $7700.00 | Window Closed / Lapsed |