US5849593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for metering a reagent into a flowing medium
Assignee: Johnson Matthey Catalysts Germany GmbH
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Filing: 1997-03-31
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Granted: 1998-12-15
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Expires: 2017-03-31
Abstract
Abstract A method for metering a reagent into a flowing medium includes adjusting a quantity of a reagent to be metered per unit of time into a flowing medium as a function of a thickness of a reaction zone in a catalytically active material. An apparatus for metering a reagent into a flowing medium includes a control unit, a device associated with the control unit for detecting a thickness of a reaction zone, and a metering device associated with the control unit for introducing a reagent into a flowing medium upstream of a catalytic converter as seen in flow direction of the medium. The control unit adjusts a quantity of the reagent to be metered into the flowing medium per unit of time by the metering device, as a function of a thickness of the reaction zone.
Inventors
- 👤 Helmut Schmelz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:28
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/206; F01N3/208; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/77; B01D53/79; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8696; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9495; G; G05; G05D; G05D11/00; G05D11/02; G05D11/13; G05D11/135; F01N2560/00; F01N2560/06; F01N2560/07; F01N2560/08; F01N2610/00; F01N2610/02; F01N2610/14; F01N2610/1453; F01N2610/146; F01N2900/00; F01N2900/06; F01N2900/08; F01N2900/14; F01N2900/1402; F01N2900/16; F01N2900/1622; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10T; Y10T436/00; Y10T436/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
138 words
A method for metering a reagent into a flowing medium and for reacting the reagent with an agent contained in the flowing medium to produce a catalytic conversion of the agent, which comprises: contacting a flowing medium having an agent with a catalytically active material of a catalytic converter for reacting the agent with a reagent to produce a catalytic conversion of the agent; metering the reagent into the flowing medium upstream of the catalytic converter; detecting a thickness of a reaction zone in the catalytically active material, the thickness of reaction zone defining a depth of the reagent absorbed in the catalytically active material; and adjusting a quantity of the reagent to be metered per unit of time into the flowing medium as a function of the thickness of the reaction zone of the catalytically active material.
Claim 2
Independent Claim
138 words
A method for metering a reagent into a flowing medium and for reacting the reagent with an agent contained in the flowing medium to produce a catalytic conversion of the agent, which comprises: contacting a flowing medium having an agent with a catalytically active material of a catalytic converter for reacting the agent with a reagent to produce a catalytic conversion of the agent; metering the reagent into the flowing medium upstream of the catalytic converter; detecting a thickness of a reaction zone in the catalytically active material, the thickness of reaction zone defining a depth of the reagent absorbed in the catalytically active material; and adjusting a quantity of the reagent to be metered per unit of time into the flowing medium as a function of the thickness of the reaction zone of the catalytically active material.
Claim 3
Dependent Claim
66 words
The method according to claim 1, which comprises raising the quantity of the reagent to be metered into the flowing medium per unit time in response to an increase of the thickness of the reaction zone and lowering the quantity of the reagent to be metered into the flowing medium per unit of time in response to a decrease in the thickness of the reaction zone.
Claim 4
Dependent Claim
125 words
The method according to claim 1, which comprises: detecting an operating state of the catalytic converter detecting a standard thickness of the reaction zone in the catalytically active material in the operating state; equating the standard thickness of the reaction zone with a setpoint value for the standard thickness; and adjusting an actual thickness of the reaction zone to the setpoint value by raising the quantity of the reagent to be metered into the flowing medium per unit of time if the actual thickness of the reaction zone is greater than the setpoint value and lowering the quantity of the reagent to be metered into the flowing medium per unit time if the actual thickness of the reaction zone is smaller than the setpoint value.
Claim 5
Dependent Claim
38 words
The method according to claim 1, which comprises detecting the thickness of the reaction zone of the catalytically active material with a sensor material and maintaining the sensor material at a temperature of from 250° to 550° C.
References Cited (Backward Citations)
US3810361A
Cited
US3813226A
Cited
US4188190A
Cited
US4160009A
Cited
US4113838A
Cited
US4302205A
Cited
US4188364A
Cited
US4314345A
Cited
US4473537A
Cited
US4473536A
Cited
US4732737A
Cited
US4692318A
Cited
US4571329A
Cited
US4751054A
Cited
US4681674A
Cited
US4820492A
Cited
US5026528A
Cited
US4963332A
Cited
EP0381236A1
Cited
US5116579A
Cited
US5047220A
Cited
US5186901A
Cited
US5314828A
Cited
US5326536A
Cited
US5643536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-12-14 | 2002-06-15 | 2002-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-12-14 | 2006-06-15 | 2006-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-12-14 | 2010-06-15 | 2010-12-15 | $7700.00 | Window Closed / Lapsed |