US3948602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analytical method of monitoring air for chloromethyl ether
Assignee: Dow Chemical Co
•
Filing: 1973-09-04
•
Granted: 1976-04-06
•
Expires: 1993-09-04
Abstract
Abstract Apparatus and method for monitoring air to determine the presence of chloromethyl methyl ether at the part per billion level. The above compound is reacted with an alkali metal salt of an alcohol, a phenol, or a chlorophenol to form a derivative which provides suitable sensitivity when applied to a gas chromatograph utilizing a suitable detector such as a hydrogen flame detector or, if a chlorophenol reactant is used, an electron capture detector.
Inventors
- 👤 Richard A. Solomon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:45
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0011; G01N33/0013; G01N31/00; G01N30/00; G01N30/02; G01N2030/022; G01N2030/025; G01N30/04; G01N30/06; Y; Y10; Y10T; Y10T436/00; Y10T436/19; Y10T436/196666
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A method for determining the presence of chloromethyl methyl ether in air at the part per billion level, comprising reacting chloromethyl methyl ether from the air with an alkali metal salt of an alcohol or a phenol, wherein said salt is contained on a solid support for reaction with said chloromethyl methyl ether, to form a dechlorinated methyl methyl ether substitution reaction product, passing the reaction product through a gas chromatographic column, then eluting the reaction product therefrom through a detector therefor and displaying the output of said detector on a readout device.
Claim 2
Independent Claim
93 words
A method for determining the presence of chloromethyl methyl ether in air at the part per billion level, comprising reacting chloromethyl methyl ether from the air with an alkali metal salt of an alcohol or a phenol, wherein said salt is contained on a solid support for reaction with said chloromethyl methyl ether, to form a dechlorinated methyl methyl ether substitution reaction product, passing the reaction product through a gas chromatographic column, then eluting the reaction product therefrom through a detector therefor and displaying the output of said detector on a readout device.
Claim 3
Dependent Claim
15 words
A method in accordance with claim 1, wherein said alkali metal salt is sodium phenate.
Claim 4
Dependent Claim
15 words
A method in accordance with claim 1, wherein said alkali metal salt is sodium ethoxide.
Claim 5
Dependent Claim
20 words
A method in accordance with claim 1, wherein said alkali metal salt is a sodium salt of a chlorinated phenol.
Claim 6
Dependent Claim
16 words
A method in accordance with claim 1, wherein said alkali metal salt is a sodium alkoxide.
Claim 7
Dependent Claim
18 words
A method in accordance with claim 1, wherein said alkali metal salt is a salt of a chlorophenol.
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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |