Patent US5732148A successfully refreshed from Google Patents.
Patent US4152118A successfully refreshed from Google Patents.
US4152118A
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Copper mercaptides as sulfur dioxide indicators
Assignee: United States Department of Energy
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Filing: 1978-06-16
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Granted: 1979-05-01
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Expires: 1998-06-16
Abstract
Abstract Organophosphine copper(I) mercaptide complexes are useful as convenient and semiquantitative visual sulfur dioxide gas indicators. The air-stable complexes form 1:1 adducts in the presence of low concentrations of sulfur dioxide gas, with an associated color change from nearly colorless to yellow-orange. The mercaptides are made by mixing stoichiometric amounts of the appropriate copper(I) mercaptide and phosphine in an inert organic solvent.
Inventors
- 👤 Phillip G. Eller
- 👤 Gregory J. Kubas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:23
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; Y; Y10; Y10T; Y10T436/00; Y10T436/18; Y10T436/186
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
74 words
A method of detecting SO 2 in an ambient atmosphere which comprises (a) contacting said atmosphere with a complex of the general formula Cu(MR 3 ) n (SR') wherein M is P, As, or Sb, n is 1 to 3, and R and R' represent an unsubstituted alkyl, cycloalkyl, aralkyl, or aryl group, and (b) monitoring any color change produced in the complex as the result of the formation of an SO 2 adduct.
Claim 2
Independent Claim
74 words
A method of detecting SO 2 in an ambient atmosphere which comprises (a) contacting said atmosphere with a complex of the general formula Cu(MR 3 ) n (SR') wherein M is P, As, or Sb, n is 1 to 3, and R and R' represent an unsubstituted alkyl, cycloalkyl, aralkyl, or aryl group, and (b) monitoring any color change produced in the complex as the result of the formation of an SO 2 adduct.
Claim 3
Dependent Claim
9 words
The method of claim 1 wherein M is P.
Claim 4
Dependent Claim
19 words
The method of claim 2 wherein said complex is in solution and said atmosphere is passed through said solution.
Claim 5
Dependent Claim
16 words
The method of claim 2 wherein said complex is a solid disposed on a suitable substrate.
Claim 6
Dependent Claim
23 words
The method of claim 4 wherein a plurality of said complexes having different sensitivities are disposed in a desired sequence on said substrate.
Claim 7
Dependent Claim
22 words
The method of claim 3 or 4 wherein R and R' are methyl, ethyl, phenyl, cyclohexyl, or C 6 F 5 .
Claim 8
Dependent Claim
40 words
A detector for SO 2 in an ambient atmosphere which comprises Cu(PR 3 ) n (SR') disposed on a suitable substrate, wherein n is 1 to 3, and R and R' represent an unsubstituted alkyl, cyclohexyl, aralkyl, or aryl group.
Claim 9
Dependent Claim
40 words
A detector for SO 2 in an ambient atmosphere which comprises Cu(PR 3 ) n (SR') disposed on a suitable substrate, wherein n is 1 to 3, and R and R' represent an unsubstituted alkyl, cyclohexyl, aralkyl, or aryl group.
References Cited (Backward Citations)
US3626742A
Cited
US3997296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |