Patent US4555491A successfully refreshed from Google Patents.
US4555491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfide chemiluminescence detection
Assignee: Iowa State University Research Foundation Inc
•
Filing: 1983-01-31
•
Granted: 1985-11-26
•
Expires: 2003-01-31
Abstract
Abstract A method of chemiluminescently determining a sulfide which is either hydrogen sulfide or methyl mercaptan by reacting the sulfide with chlorine dioxide at low pressure and under conditions which allow a longer reaction time in emission of a single photon for every two sulfide containing species, and thereafter, chemiluminescently detecting and determining the sulfide. The invention also relates not only to the detection method, but the novel chemical reaction and a specifically designed chemiluminescence detection cell for the reaction.
Inventors
- 👤 Stanford R. Spurlin
- 👤 Edward S. Yeung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:47
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/75; G01N21/76; G01N21/766; Y; Y10; Y10T; Y10T436/00; Y10T436/18; Y10T436/182; Y10T436/19
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A method of chemiluminescently determining the presence of a sulfide containing compound in a gas sample where the sulfide containing compound is selected from the group consisting of hydrogen sulfide and methyl mercaptan, comprising: reacting a gas sample with chlorine dioxide, at a pressure of 40 torr or below, to provide emission of a single photon for every two molecules of sulfide containing compound present in said sample; and chemiluminescently detecting any photons so emitted as an indication of the presence of said sulfide containing compound.
Claim 2
Independent Claim
86 words
A method of chemiluminescently determining the presence of a sulfide containing compound in a gas sample where the sulfide containing compound is selected from the group consisting of hydrogen sulfide and methyl mercaptan, comprising: reacting a gas sample with chlorine dioxide, at a pressure of 40 torr or below, to provide emission of a single photon for every two molecules of sulfide containing compound present in said sample; and chemiluminescently detecting any photons so emitted as an indication of the presence of said sulfide containing compound.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the pressure is within the range of from about 20 torr to about 40 torr.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the pressure is within the range of from about 25 torr to about 35 torr.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the pressure is about 30 torr.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein the sulfide containing compound is methyl mercaptan.
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) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |