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Patent US4197459A successfully refreshed from Google Patents.
US4197459A
Expired / Lapsed
US
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Electro-optical device for the detection of the presence of liquid
Assignee: Individual
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Filing: 1978-07-31
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Granted: 1980-04-08
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Expires: 1998-07-31
Abstract
Abstract An electro-optical device for the detection of the presence of a liquid, comprising at least one monochromatic infrared transmitter arranged at the region of a hollow body probe composed of a synthetic high molecular substance and totally reflecting the infrared radiation. There are also provided at least one infrared receiver and a circuit for signal processing. At least at the region of at least a boundary surface which totally reflects the infrared radiation the hollow body probe consists of a halogen-containing polymerizate.
Inventors
- 👤 Benno Perren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:13
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/284; G01F23/292; G01F23/2921; G01F23/2922; G01F23/2925; G01N; G01N21/00; G01N21/84; G01N21/85; G01N21/8507
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
An electro-optical device for the detection of the presence of a liquid, comprising: a hollow body probe composed of a synthetic, polymerized substance and totally reflective for infrared radiation; at least one monochromatic infrared transmitter arranged at the region of the hollow body probe; at least one infrared receiver; said hollow body probe having at least one boundary surface which totally reflects the infrared radiation; and said hollow body probe containing a halogen-containing polymerizate at least at the region of the boundary surface which totally reflects the infrared radiation.
Claim 2
Dependent Claim
89 words
An electro-optical device for the detection of the presence of a liquid, comprising: a hollow body probe composed of a synthetic, polymerized substance and totally reflective for infrared radiation; at least one monochromatic infrared transmitter arranged at the region of the hollow body probe; at least one infrared receiver; said hollow body probe having at least one boundary surface which totally reflects the infrared radiation; and said hollow body probe containing a halogen-containing polymerizate at least at the region of the boundary surface which totally reflects the infrared radiation.
Claim 3
Dependent Claim
40 words
The electro-optical device as defined in claim 1, wherein: said hollow body probe contains a body formed of a halogen-containing polymerizate selected from the group consisting essentially of: fluoroethylenepropylene, perfluoroalkoxy, polychlorotrifluoroethylene, ethylenechlorotrifluoroethylene, ethylene tetrafluoroethylene, polyvinyl fluoride, polyvinylidene fluoride and polytetrafluoroethylene.
Claim 4
Dependent Claim
16 words
The electro-optical device as defined in claim 2, further including: means for axially displacing said body.
Claim 5
Dependent Claim
25 words
The electro-optical device as defined in claim 2, wherein: said hollow body probe contains at least two parts which are telescopically displaceable within one another.
Claim 6
Dependent Claim
30 words
The electro-optical device as defined in claim 1, further including: at least one heating element arranged at the region of the totally reflecting boundary surface of the hollow body probe.
Claim 7
Dependent Claim
80 words
The electro-optical device as defined in claim 1, wherein: said infrared transmitter has an optical axis; said infrared transmitter having a maximum radiation intensity of less than about 200 mW/sterad; the main maximum of the spatial radiation distribution at least being approximately axially symmetrical and aligned essentially in the direction of the optical axis of the infrared transmitter; and the spatial distribution of the radiation intensity in the plane of half power having a half-angle aperture of less than 4°.
References Cited (Backward Citations)
US3906232A
Cited
US4020345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |