Patent US4423152A successfully refreshed from Google Patents.
US4423152A
Expired / Lapsed
US
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Effluent detection methods
Assignee: York Research Corp
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Filing: 1981-06-08
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Granted: 1983-12-27
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Expires: 2001-06-08
Abstract
Abstract Methods and compositions of matter are disclosed, useful in detecting the source of particulate, gaseous borne effluents, comprising lanthanides which may be introduced into combustion processes. Sources may thereby be identified from the analytical responses of effluent particles as compared to those predicted for the introduced lanthanides which have been subjected to the known combustion conditions at the source.
Inventors
- 👤 David F. Lewis
- 👤 Edward J. Kaplin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:05
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0011; Y; Y10; Y10T; Y10T436/00; Y10T436/13
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
115 words
A method of monitoring the gaseous, particle-bearing effluent of combustion, comprising the steps of combining with combustible material at least two tracer elements chosen from the lanthanide group in a pre-determined ratio with respect to each other, subjecting said combination to combustion under said known conditions, gathering at least one sample of particles from gaseous effluent, determining by means of elemental analytical means the ratio, with respect to each other, of the responses of said sample corresponding to those exhibited by said tracer elements before they were combined with said combustible material, and comparing said ratio of responses of said sample to that of said tracer elements before they were combined with said combustible material.
Claim 2
Independent Claim
115 words
A method of monitoring the gaseous, particle-bearing effluent of combustion, comprising the steps of combining with combustible material at least two tracer elements chosen from the lanthanide group in a pre-determined ratio with respect to each other, subjecting said combination to combustion under said known conditions, gathering at least one sample of particles from gaseous effluent, determining by means of elemental analytical means the ratio, with respect to each other, of the responses of said sample corresponding to those exhibited by said tracer elements before they were combined with said combustible material, and comparing said ratio of responses of said sample to that of said tracer elements before they were combined with said combustible material.
Claim 3
Dependent Claim
19 words
The method described in claim 1 wherein said combining step comprises combining dysprosium and gadolinium with said combustible material.
Claim 4
Dependent Claim
35 words
The method described in claim 1 wherein said combining step comprises the step of combining with said combustible material dysprosium and gadolinium in weight ratio of about one part gadolinium to about two parts dysprosium.
Claim 5
Dependent Claim
22 words
The method described in claim 1 wherein said combining step comprises the step of combining with said combustible material dysprosium and lanthanum.
Claim 6
Dependent Claim
35 words
The method described in claim 1 wherein said combining step comprises the step of combining with said combustible material dysprosium and lanthanum in weight ratio of about one part lanthanum to about two parts dysprosium.
Claim 7
Dependent Claim
26 words
The method described in claim 1 wherein said combining step comprises the step of combining with said combustible material lanthanum stearate, dysprosium stearate and gadolinium stearate.
Claim 8
Dependent Claim
46 words
The method described in claim 1 wherein said combining step comprises the step of combining with said combustible material lanthanum stearate, dysprosium stearate and gadolinium stearate in weight ratios of about 0.5 to about 1 to about 1.5 of the lanthanum, dysprosium and gadolinium contents respectively.
References Cited (Backward Citations)
US3979503A
Cited
US3574550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |