EP0298463A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Vaporizable liquid detection element
Assignee: Junkosha Co Ltd
•
Filing: 1988-07-06
•
Granted: —
•
Expires: 2008-07-06
Abstract
Abstract Vaporizable liquid detection element having at least a pair of electrodes (4a, 4b) bridged by a gas sensible member (2a). The gas sensible member is formed by resin material containing a conductive substance and shows changes of impedance when it is in contact with the vaporized gas of the liquid to be detected.
Inventors
- 👤 Jyuji C/O Junkosha Co. Ltd. Akiba
- 👤 Kazuyuki C/O Junkosha Co. Ltd. Kojima
- 👤 Hiroyuki C/O Junkosha Co. Ltd. Sugibuchi
- 👤 Hiroshi C/O Junkosha Co. Ltd. Satoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 12:08
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/125; G01N27/126
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
56 words
Vaporizable liquid detection element having at least a pair of electrodes (4a, 4b) bridged by a gas sensible member (2a), characterized in that said gas sensible member is formed by resin material containing a conductive substance and shows changes of impedance when it is in contact with the vaporized gas of the liquid to be detected.
Claim 2
Dependent Claim
56 words
Vaporizable liquid detection element having at least a pair of electrodes (4a, 4b) bridged by a gas sensible member (2a), characterized in that said gas sensible member is formed by resin material containing a conductive substance and shows changes of impedance when it is in contact with the vaporized gas of the liquid to be detected.
Claim 3
Dependent Claim
23 words
Vaporizable liquid detection element according to claim 1, characterized in that the conductive substance of said gas sensible member (2a) is carbon powder.
Claim 4
Dependent Claim
23 words
Vaporizable liquid detection element according to claims 1 or 2, characterized in that the resin material is unbaked tetrafluoride ethylene resin forming material.
Claim 5
Dependent Claim
24 words
Vaporizable liquid detection element according to claim 1 or 2, characterized in that the resin material is imcompletely baked tetrafluoride ethylene resin forming material.
Claim 6
Dependent Claim
25 words
Vaporizable liquid detection element according to claim 1 or 2, characterized in that the resin material is unsintered expanded porous tetrafluoride ethylene resin composing material.
Claim 7
Dependent Claim
21 words
Vaporizable liquid detecting element according to claim 1 or 2, characterized in that the resin material is imcompletely sintered porous polytetrafluoroethylene.
Claim 8
Dependent Claim
68 words
Vaporizable liquid detection element according to anyone of claims 1 through 6, characterized by said electrodes (4a, 4b) being connected to a measuring means (7) outputting impedance change of the gas sensible member as a function of impedance and discriminating means (8) being connected to the output of said measuring means (7) for discriminating the liquid to be detected depending on the output of said measuring means (7).
Claim 9
Dependent Claim
61 words
Method for producing the detection element of claims 1 through 6, characterized by - mixing PTFE-powder and carbon powder in a mixing machine, - adding a lubricating agent, - pressing the mixture into a cylinder to form a billet, - extruding the billet to form a conductive tape (2a), - connecting the conductive tape to a pair of electrodes (4a, 4b).
Claim 10
Dependent Claim
16 words
Method according to claim 8, characterized in that the conductive tape is expanded after its extrusion.
Claim 11
Dependent Claim
34 words
Method according to claim 8 or 9, characterized in that the PTFE-powder is dispersed in a solvent before mixing it with the carbon powder and the mixture of PTFE and carbon powder being desiccated.
Claim 12
Dependent Claim
40 words
Method according to anyone of claim 8 through 10, characterized in that the conductive tape (2a) is covered on at least one side of it with a porous PTFE tape before connecting it to said pair of electrodes (4a, 4b).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.