US4841769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring velocity of flow
Assignee: Robert Bosch GmbH
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Filing: 1987-03-03
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Granted: 1989-06-27
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Expires: 2007-03-03
Abstract
Abstract In an apparatus for measuring the velocity of flow of fluids, and particularly of the intake air of internal combustion engines, having an electrically heatable resistance layer which is applied in insulated manner on a support and is in thermal contact with the flowing fluid, the support is developed in rectangular shape with a flat central part bearing the resistance layer and is provided with reinforcement strips integral with it on at least three sides. Futhermore, the central part is provided at its edges with slits which adjoin the reinforcement strips. The apparatus of the invention can be produced preferably from silicon by etching and can be developed to receive futher resistors and other electronic elements.
Inventors
- 👤 Wolfgang Porth
- 👤 Wolfgang Weibler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:16
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/68; G01F1/684; G01F1/6845; G01P; G01P5/00; G01P5/10; G01P5/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
In an apparatus for measuring the velocity of flow of fluids, and particularly of the intake air of internal-combustion engines, the apparatus having an electrically heatable resistance layer which is applied in insulated manner on a support, which layer is in thermal contact with the flowing fluid, the improvement wherein the support is rectangular and includes a flat central part which carries a resistance layer, the support further comprising reinforcement strips integral one-piece therewith on at least three sides of the support for securing the resistance layer, the apparatus further comprising outer thermally insulating layers of low thermal conductivity overlying said resistance layer, said support and the side of said support facing away from the resistance layer, and wherein the insulating layers decrease in thickness continuously in the direction of flow.
Claim 2
Dependent Claim
131 words
In an apparatus for measuring the velocity of flow of fluids, and particularly of the intake air of internal-combustion engines, the apparatus having an electrically heatable resistance layer which is applied in insulated manner on a support, which layer is in thermal contact with the flowing fluid, the improvement wherein the support is rectangular and includes a flat central part which carries a resistance layer, the support further comprising reinforcement strips integral one-piece therewith on at least three sides of the support for securing the resistance layer, the apparatus further comprising outer thermally insulating layers of low thermal conductivity overlying said resistance layer, said support and the side of said support facing away from the resistance layer, and wherein the insulating layers decrease in thickness continuously in the direction of flow.
Claim 3
Dependent Claim
131 words
In an apparatus for measuring the velocity of flow of fluids, and particularly of the intake air of internal-combustion engines, the apparatus having an electrically heatable resistance layer which is applied in insulated manner on a support, which layer is in thermal contact with the flowing fluid, the improvement wherein the support is rectangular and includes a flat central part which carries a resistance layer, the support further comprising reinforcement strips integral one-piece therewith on at least three sides of the support for securing the resistance layer, the apparatus further comprising outer thermally insulating layers of low thermal conductivity overlying said resistance layer, said support and the side of said support facing away from the resistance layer, and wherein the insulating layers decrease in thickness stepwise in the direction of flow.
Claim 4
Dependent Claim
131 words
In an apparatus for measuring the velocity of flow of fluids, and particularly of the intake air of internal-combustion engines, the apparatus having an electrically heatable resistance layer which is applied in insulated manner on a support, which layer is in thermal contact with the flowing fluid, the improvement wherein the support is rectangular and includes a flat central part which carries a resistance layer, the support further comprising reinforcement strips integral one-piece therewith on at least three sides of the support for securing the resistance layer, the apparatus further comprising outer thermally insulating layers of low thermal conductivity overlying said resistance layer, said support and the side of said support facing away from the resistance layer, and wherein the insulating layers decrease in thickness stepwise in the direction of flow.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |