Patent US4412449A successfully refreshed from Google Patents.
US4412449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the flow velocities of gases and liquids
Assignee: Evonik Operations GmbH
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Filing: 1981-03-10
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Granted: 1983-11-01
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Expires: 2001-03-10
Abstract
Abstract An apparatus for the measurement of the flow velocity of gases and liquids, particularly the intake air of combustion engines, includes one or more temperature dependent at least partially heated resistances disposed behind a protective shield which produces a turbulent flow which flow is rendered laminar by interposing a honeycomb of wire screen between the protective shield and the resistance element.
Inventors
- 👤 Kurt Eiermann
- 👤 Wolfgang Schafer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:07
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/68; G01F1/684; G01F1/6842; F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; G01P; G01P5/00; G01P5/10; G01P5/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
In an apparatus for measuring the flow velocity of gases and liquids, especially the intake air of combustion engines, having at least one temperature dependent resistance and where at least one of the resistances is heated, wherein the heated resistance is disposed downstream from a protective shield means, the improvement comprising, positioned between the protective shield means and the heated resistance, means for producing a laminar flow, and means for producing laminar flow positioned behind the heated resistance, said means for producing a laminar flow before and after the heated resistance comprising connecting honeycombs having a hollow space therein and wherein said resistance is positioned in said hollow space.
Claim 2
Dependent Claim
109 words
In an apparatus for measuring the flow velocity of gases and liquids, especially the intake air of combustion engines, having at least one temperature dependent resistance and where at least one of the resistances is heated, wherein the heated resistance is disposed downstream from a protective shield means, the improvement comprising, positioned between the protective shield means and the heated resistance, means for producing a laminar flow, and means for producing laminar flow positioned behind the heated resistance, said means for producing a laminar flow before and after the heated resistance comprising connecting honeycombs having a hollow space therein and wherein said resistance is positioned in said hollow space.
Claim 3
Dependent Claim
14 words
An apparatus according to claim 1 wherein the protective shield is a solid body.
Claim 4
Dependent Claim
21 words
An apparatus according to claim 1 wherein the temperature dependent resistance comprises a thin metal layer on an electrically insulating support.
Claim 5
Dependent Claim
14 words
An apparatus according to claim 1 wherein the protective shield is a wire screen.
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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |