US4108604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analytical method for TNT in water
Assignee: United States Department of the Navy
•
Filing: 1977-07-18
•
Granted: 1978-08-22
•
Expires: 1997-07-18
Abstract
Abstract A method for analyzing water for α-trinitrotoluene comprising the ss of allowing the water to flow over an ion exchange resin which contains a quaternary ammonium group and observing to determine whether or not a chemical reaction takes place.
Inventors
- 👤 Carl A. Heller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:27
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/18; G01N33/1826; G01N31/00; G01N31/22; Y; Y02; Y02A; Y02A20/00; Y02A20/20; Y10; Y10T; Y10T436/00; Y10T436/17
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
49 words
A method for determining whether or not trinitrotoluene is present in water comprising the steps of: A. allowing a sample of said water to flow over an ion exchange resin that is coated with a fluorescent dye; and B. observing whether or not the fluorescence of the dye changes.
Claim 2
Independent Claim
49 words
A method for determining whether or not trinitrotoluene is present in water comprising the steps of: A. allowing a sample of said water to flow over an ion exchange resin that is coated with a fluorescent dye; and B. observing whether or not the fluorescence of the dye changes.
Claim 3
Dependent Claim
12 words
A method according to claim 1 wherein said fluorescent dye is rhodamine-B.
Claim 4
Dependent Claim
12 words
A method according to claim 2 wherein said fluorescent dye is fluoroscein.
Claim 5
Dependent Claim
15 words
A method according to claim 1 wherein said ion exchange resin contains quaternary ammonium groups.
Claim 6
Dependent Claim
13 words
A method according to claim 4 wherein said fluorescent dye is rhodamine B.
Claim 7
Dependent Claim
12 words
A method according to claim 4 wherein said fluorescent dye is fluoroscein.
Claim 8
Independent Claim
52 words
A method for determining whether or not trinitrotoluene is present in water comprising the steps of: A. allowing a sample of said water to flow over a film of resin which changes color when reacted with trinitrotoluene; and B. observing said resin to determine whether or not a color change takes place.
Claim 9
Independent Claim
52 words
A method for determining whether or not trinitrotoluene is present in water comprising the steps of: A. allowing a sample of said water to flow over a film of resin which changes color when reacted with trinitrotoluene; and B. observing said resin to determine whether or not a color change takes place.
Claim 10
Dependent Claim
17 words
A method according to claim 7 whrerein said resin is a resin which contains quaternary ammonium groups.
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) | 1981-08-21 | 1982-02-20 | 1982-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-21 | 1986-02-20 | 1986-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-21 | 1990-02-20 | 1990-08-22 | $7700.00 | Window Closed / Lapsed |