US4033720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unitary sampling and analysis strip and process
Assignee: United States Department of the Army
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Filing: 1974-05-31
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Granted: 1977-07-05
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Expires: 1994-05-31
Abstract
Abstract A gas or liquid filter and analysis strip and process of detection using it with a thin-layer chromatographic process. The invention described herein may be manufactured and used by or for the government for government purposes without the payment of royalties thereon or therefor.
Inventors
- 👤 Achille Silvestri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:52
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/90; G01N30/92; G01N31/00; G01N31/22; G01N31/223; G01N31/224; G01N33/00; G01N33/48; G01N33/50; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/200833; Y10T436/25; Y10T436/25125
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A method of detecting contaminants in fluids comprising the steps of: providing a unitary contaminant sampling and chromatographic analysis strip having a filter portion which is fluid porous with pores smaller than contaminants and a chromatographic portion disposed longitudinally therefrom; collecting a contaminant sample upon the said filter portion by traversely passing a contaminant containing fluid through the pores of the filter portion without engaging the said chromatographic portion and thereby leaving a contaminant sample upon said filter portion; chromatographing said sample with the application of a solvent to the sample and said strip; and then analyzing the resultant chromatographic portion.
Claim 2
Independent Claim
101 words
A method of detecting contaminants in fluids comprising the steps of: providing a unitary contaminant sampling and chromatographic analysis strip having a filter portion which is fluid porous with pores smaller than contaminants and a chromatographic portion disposed longitudinally therefrom; collecting a contaminant sample upon the said filter portion by traversely passing a contaminant containing fluid through the pores of the filter portion without engaging the said chromatographic portion and thereby leaving a contaminant sample upon said filter portion; chromatographing said sample with the application of a solvent to the sample and said strip; and then analyzing the resultant chromatographic portion.
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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |