GB1242206A - Method for detecting circuit discontinuities - Google Patents

Method for detecting circuit discontinuities

Info

Publication number
GB1242206A
GB1242206A GB4461/70A GB446170A GB1242206A GB 1242206 A GB1242206 A GB 1242206A GB 4461/70 A GB4461/70 A GB 4461/70A GB 446170 A GB446170 A GB 446170A GB 1242206 A GB1242206 A GB 1242206A
Authority
GB
United Kingdom
Prior art keywords
liquid crystals
layer
windscreen
jan
heating elements
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.)
Expired
Application number
GB4461/70A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PPG Industries Inc
Original Assignee
PPG Industries Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by PPG Industries Inc filed Critical PPG Industries Inc
Publication of GB1242206A publication Critical patent/GB1242206A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Liquid Crystal (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

1,242,206. Laminates. P.P.G. INDUSTRIES Inc. 30 Jan., 1970 [31 Jan., 1969; 31 Dec., 1969], No. 4461/70. Heading B5N. [Also in Division G1] A lamina structure 15, Fig. 2, comprising a layer of cholesteric-phase liquid-crystal material 17 sandwiched between two flexible transparent plastics layers 16, 18 is temporarily fixed to a windscreen G, Fig. 1, by an adhesive layer 19, so that defective heating elements 12 embedded in, or on the surface of, the windscreen, can be located-operative heating elements 11 causing a colour change in the liquid crystals. Preferably the liquid crystals have a colour range of from 20‹ to 30‹ C. which can be achieved by using appropriate mixtures, for example of cholesteryl myristate and cholesteryl butyrate. Alternatively, in order to cover a large temperature range, the layer of liquid crystals may consist of strips of different liquid crystal material having different temperature ranges.
GB4461/70A 1969-01-31 1970-01-30 Method for detecting circuit discontinuities Expired GB1242206A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US79545469A 1969-01-31 1969-01-31
US88948669A 1969-12-31 1969-12-31

Publications (1)

Publication Number Publication Date
GB1242206A true GB1242206A (en) 1971-08-11

Family

ID=27121620

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4461/70A Expired GB1242206A (en) 1969-01-31 1970-01-30 Method for detecting circuit discontinuities

Country Status (5)

Country Link
JP (1) JPS4811190B1 (en)
BE (1) BE745228A (en)
DE (1) DE2003474A1 (en)
FR (1) FR2029798A1 (en)
GB (1) GB1242206A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2197109A (en) * 1986-09-17 1988-05-11 Liquid Crystal Devices Ltd Laminated product incorporating thermochromic liquid crystal material

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51109151U (en) * 1975-02-24 1976-09-01
JPS51109355A (en) * 1975-03-22 1976-09-28 Kotobuki Kogyo Kk TOKYO KYUSOCHI

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2197109A (en) * 1986-09-17 1988-05-11 Liquid Crystal Devices Ltd Laminated product incorporating thermochromic liquid crystal material
GB2197109B (en) * 1986-09-17 1990-09-12 Liquid Crystal Devices Ltd Gb8721762.6roduct incorporating thermochromic liquid crystal material

Also Published As

Publication number Publication date
JPS4811190B1 (en) 1973-04-11
FR2029798A1 (en) 1970-10-23
DE2003474A1 (en) 1970-10-01
BE745228A (en) 1970-07-30

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