FR2386028A1 - Icing risk indicator for vehicles - uses multiple film containing liq. crystals, stuck on windscreen, giving colour change under one degree centigrade - Google Patents
Icing risk indicator for vehicles - uses multiple film containing liq. crystals, stuck on windscreen, giving colour change under one degree centigradeInfo
- Publication number
- FR2386028A1 FR2386028A1 FR7709128A FR7709128A FR2386028A1 FR 2386028 A1 FR2386028 A1 FR 2386028A1 FR 7709128 A FR7709128 A FR 7709128A FR 7709128 A FR7709128 A FR 7709128A FR 2386028 A1 FR2386028 A1 FR 2386028A1
- Authority
- FR
- France
- Prior art keywords
- windscreen
- stuck
- crystals
- vehicles
- multiple film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/12—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance
- G01K11/16—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance of organic materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01W—METEOROLOGY
- G01W1/00—Meteorology
- G01W1/14—Rainfall or precipitation gauges
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Atmospheric Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The vehicle frost indicator consists of a multiple film enclosing liquid crystals, for example cholesterics. The liquid crystals give instantaneous display of the temperature by light emission in the visible spectrum range. The film is stuck directly onto the windscreen or the surface of the exterior rear view mirror. Whatever the interior temperature of the vehicle, the thermal resistance of the windscreen is sufficient to ensure that the film is in equilibrium with the exterior air as soon as the vehicle moves. The liquid crystals are arranged to display a lette for example F for frost or I for ice and will take a determine spectral colour for an exterior temperature less then +1 deg.C.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7709128A FR2386028A1 (en) | 1977-03-28 | 1977-03-28 | Icing risk indicator for vehicles - uses multiple film containing liq. crystals, stuck on windscreen, giving colour change under one degree centigrade |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7709128A FR2386028A1 (en) | 1977-03-28 | 1977-03-28 | Icing risk indicator for vehicles - uses multiple film containing liq. crystals, stuck on windscreen, giving colour change under one degree centigrade |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2386028A1 true FR2386028A1 (en) | 1978-10-27 |
Family
ID=9188631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7709128A Withdrawn FR2386028A1 (en) | 1977-03-28 | 1977-03-28 | Icing risk indicator for vehicles - uses multiple film containing liq. crystals, stuck on windscreen, giving colour change under one degree centigrade |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2386028A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4316557A1 (en) * | 1993-05-18 | 1994-11-24 | Hella Kg Hueck & Co | Device for detecting the degree of misting or icing of a motor vehicle pane (window) |
EP0989392A1 (en) * | 1998-09-23 | 2000-03-29 | Britax (Geco) S.A. | Temperature indicator for motor vehicle |
WO2000079230A1 (en) * | 1999-06-08 | 2000-12-28 | Array Displays Ab | Temperature indicator comprising a temperature sensitive material |
-
1977
- 1977-03-28 FR FR7709128A patent/FR2386028A1/en not_active Withdrawn
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4316557A1 (en) * | 1993-05-18 | 1994-11-24 | Hella Kg Hueck & Co | Device for detecting the degree of misting or icing of a motor vehicle pane (window) |
EP0989392A1 (en) * | 1998-09-23 | 2000-03-29 | Britax (Geco) S.A. | Temperature indicator for motor vehicle |
US6592255B1 (en) | 1998-09-23 | 2003-07-15 | Bernard Duroux | Temperature indicator for motor vehicle |
WO2000079230A1 (en) * | 1999-06-08 | 2000-12-28 | Array Displays Ab | Temperature indicator comprising a temperature sensitive material |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4109235A (en) | Electronic-display instrument panels for automotive vehicles | |
CA1025693A (en) | Temperature measurement with thermographic film | |
GB1161039A (en) | A Visual Display Device | |
US5304003A (en) | Stick-on aquarium thermometers and the like | |
GB2137394A (en) | Liquid crystal display device | |
FR2386028A1 (en) | Icing risk indicator for vehicles - uses multiple film containing liq. crystals, stuck on windscreen, giving colour change under one degree centigrade | |
US2802442A (en) | In-line speedometer indicator | |
ES8501977A1 (en) | Improved temperature-responsive pacifier assembly. | |
JPS52104256A (en) | Thickness measuring device | |
US4426881A (en) | Liquid crystal pressure gauge | |
JPS54119897A (en) | Liquid crystal display unit | |
CA1025682A (en) | Open well typed refrigerated display case with reverse flow of air bands | |
FR2274966A1 (en) | Large wall clock incorporating temperature indication - latter employing series of different coloured elements | |
CH559134A5 (en) | Frozen food pack - built in capsule melts indicating that safe temperature has been exceeded | |
FR2349824A1 (en) | Defrosting indicator for frozen foods - employs clear plastic cell containing substance which diffuses into surrounding material if temp. rises above limit | |
GB1283342A (en) | Improvements relating to temperature indicators | |
US3604781A (en) | Reflector for warning road traffic of icing conditions | |
US2430690A (en) | Speed indicator | |
GB1297195A (en) | ||
GB1281321A (en) | Improvements in or relating to low-temperature warning devices | |
GB1414905A (en) | Motor vehicle rear view mirror assembly | |
US1460909A (en) | Device | |
FR2353029A1 (en) | Cooling appts. with liq. reservoir set in ground - has thermal diol coupling liq. and radiation emitting surface housed beneath plastics cover | |
JPS5542072A (en) | Variable-hue timepiece with multiple colored layer | |
CA1012222A (en) | Resistor with low temperature coefficient |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |