US5013668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of estimating a cumulative exposure to a compound of a gas and apparatus therefor
Assignee: Imperial Chemical Industries Ltd
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Filing: 1989-02-10
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Granted: 1991-05-07
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Expires: 2009-02-10
Abstract
Abstract A method of estimating a cumulative exposure to a component of a gas which comprises contacting a liquid reagent held by surface tension in a reservoir with a body of the gas through a conduit into which substantially only diffusional migration of the component from the body of gas occurs.
Inventors
- 👤 Bernard Fields
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:03
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/223; G01N31/224; Y; Y10; Y10S; Y10S435/00; Y10S435/807; Y10S436/00; Y10S436/807; Y10S436/902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A method of determining a cumulative exposure to a component of a gas, comprising: providing a reservoir means; providing conduit means for defining a path of communication between said reservoir means and a body of gas to be monitored, said conduit means allowing substantially only diffusional migration of a component of interest of the gas from the body of gas to the reservoir means; placing a liquid reagent in said reservoir means; holding said liquid reagent in said reservoir means substantially only by surface tension; exposing said liquid reagent to said body of gas through said conduit means and determining the amount of the component of gas absorbed by the liquid reagent.
Claim 2
Independent Claim
112 words
A method of determining a cumulative exposure to a component of a gas, comprising: providing a reservoir means; providing conduit means for defining a path of communication between said reservoir means and a body of gas to be monitored, said conduit means allowing substantially only diffusional migration of a component of interest of the gas from the body of gas to the reservoir means; placing a liquid reagent in said reservoir means; holding said liquid reagent in said reservoir means substantially only by surface tension; exposing said liquid reagent to said body of gas through said conduit means and determining the amount of the component of gas absorbed by the liquid reagent.
Claim 3
Dependent Claim
24 words
A method as in claim 1, wherein said step of placing a liquid reagent comprises placing a liquid reagent which is a color indicator.
Claim 4
Dependent Claim
48 words
A method as in claim 2, wherein said step of providing a reservoir means comprises providing a plurality of reservoirs and wherein said step of placing a liquid reagent comprises placing liquid reagents of differing sensitivity to the component of interest to be measured in each said reservoir.
Claim 5
Dependent Claim
44 words
A method as in claim 2, wherein said step of providing a reservoir means comprises providing a plurality of reservoirs and wherein said step of providing a conduit means comprises providing conduits having differing diffusional access between said reservoirs and the body of gas.
Claim 6
Dependent Claim
28 words
A method as in claim 1, wherein said step of placing a liquid reagent comprises placing a liquid reagent which is a solvent for the component of interest.
Claim 7
Dependent Claim
24 words
A method as claimed in claim 1, wherein said step of placing a liquid reagent comprises placing a reagent comprising a viscosity increasing agent.
Claim 8
Dependent Claim
33 words
A method as claimed in claim 1, wherein said step of providing a conduit means comprises providing a conduit having a downwardly opening inlet for minimizing ingress of dust into said reservoir means.
Claim 9
Dependent Claim
25 words
A method as in claim 1, wherein said body of gas and said liquid reagent are in substantially unimpeded gas contact through the conduit means.
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) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |