US3709035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow level sensing system with flow electrical transducer, and its application
Assignee: FRIES J DE
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Filing: 1970-12-15
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Granted: 1973-01-09
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Expires: 1990-12-15
Abstract
Abstract A flow rate sensing system with a flow-electrical transducer for the monitoring of the flow of a medium by at least one electrically heatable resistance wire which is incorporated directly into the thermoplastic flow channel wall, the resistance wire has areas of small and large diameters with the small diameter portion in the flow channel and the large diameter imbedded in the wall of the flow channel.
Inventors
- 👤 Fries J De
- 👤 E Tresch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:50
CPC Classifications
G; G01; G01P; G01P5/00; G01P5/10; G01P5/12; G01F; G01F1/00; G01F1/68; G01F1/684; G06; G06K; G06K7/00; G06K7/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
Flow rate sensing system comprising a flow channel formed of thermoplastic material; at least one electrically heatable resistance wire within said flow channel, said wire having areas with small and large diameters, with the small diameter portion of the wire being arranged completely inside said flow channel, thereby acting as a sensor area, and with the large diameter portion of the wire being imbedded in and supported by the wall of said flow channel, the operating temperature of the heatable wire being above the melting temperature of said thermoplastic material; and circuit means connected to said resistance wire for electrically distinguishing between different resistance rates corresponding to different flow rates.
Claim 2
Dependent Claim
110 words
Flow rate sensing system comprising a flow channel formed of thermoplastic material; at least one electrically heatable resistance wire within said flow channel, said wire having areas with small and large diameters, with the small diameter portion of the wire being arranged completely inside said flow channel, thereby acting as a sensor area, and with the large diameter portion of the wire being imbedded in and supported by the wall of said flow channel, the operating temperature of the heatable wire being above the melting temperature of said thermoplastic material; and circuit means connected to said resistance wire for electrically distinguishing between different resistance rates corresponding to different flow rates.
Claim 3
Dependent Claim
54 words
An apparatus in accordance with claim 1 for reading binary information stored on an information medium further including means for feeding a storage location of a binary information storage medium past said flow channel whereby the flow-rate within said flow channel changes as a function of the binary information stored on the information medium.
Claim 4
Dependent Claim
60 words
An apparatus according to claim 2 for reading a multi-channel information medium, such as a punched card or a punched tape, further including an integrated circuit board carrying several flow rate sensing systems in a parallel configuration, each said system being positioned over one track on the information medium and said circuit means being located on said integrated circuit board.
Claim 5
Dependent Claim
38 words
An apparatus according to claim 3, wherein said integrated circuit board includes a multi-purpose connector means for electrically connecting said integrated circuit board to other circuits and for connecting said flow channels with a source of flow medium.
Claim 6
Dependent Claim
26 words
An apparatus according to claim 3, wherein said flow channels are arranged within one plane which is parallel to the plane of said integrated circuit board.
Claim 7
Dependent Claim
94 words
An apparatus for indicatIng the proximity of an object comprising the system of claim 1, an outer flow channel which coaxially surrounds the flow channel of said system, said outer channel and said channel having concentric orifices, flow source means for causing a flow medium to pass through said outer channel producing a flow from said orifice towards the object whereby the flow level through said flow channel is varied by the space between the object and the orifice, which variation is sensed by said electrically heatable resistance wire arranged within said flow channel.
Claim 8
Dependent Claim
26 words
Apparatus according to claim 6, wherein the outer flow channel has a small cross-section near said flow source means, which cross-section widens toward said nozzle-like orifice.
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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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |