GB675752A - Improvements in or relating to electrical resistors - Google Patents

Improvements in or relating to electrical resistors

Info

Publication number
GB675752A
GB675752A GB3109647A GB3109647A GB675752A GB 675752 A GB675752 A GB 675752A GB 3109647 A GB3109647 A GB 3109647A GB 3109647 A GB3109647 A GB 3109647A GB 675752 A GB675752 A GB 675752A
Authority
GB
United Kingdom
Prior art keywords
oxide
medium
mixture
cadmium
cadmium oxide
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
GB3109647A
Inventor
Cyril Francis Drake
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB3109647A priority Critical patent/GB675752A/en
Priority to FR975301D priority patent/FR975301A/en
Priority to NL143475A priority patent/NL77160C/xx
Priority to BE485966D priority patent/BE485966A/xx
Publication of GB675752A publication Critical patent/GB675752A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/06—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators
    • H03D3/08—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of diodes, e.g. Foster-Seeley discriminator
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/06—Apparatus or processes specially adapted for manufacturing resistors adapted for coating resistive material on a base
    • H01C17/065—Apparatus or processes specially adapted for manufacturing resistors adapted for coating resistive material on a base by thick film techniques, e.g. serigraphy
    • H01C17/06506—Precursor compositions therefor, e.g. pastes, inks, glass frits
    • H01C17/06513—Precursor compositions therefor, e.g. pastes, inks, glass frits characterised by the resistive component
    • H01C17/06533—Precursor compositions therefor, e.g. pastes, inks, glass frits characterised by the resistive component composed of oxides
    • H01C17/06546—Oxides of zinc or cadmium

Abstract

675,752. Resistance coatings and deposits. STANDARD TELEPHONES & CABLES, Ltd. Nov. 19, 1948 [Nov. 24, 1947], No. 31096/47. Class 37. [Also in Group XV] A method of producing a resistor includes the steps of (1) mixing a chemical compound having electronic semi-conducting properties (i.e. a non- electrolytic compound which deviates from strict stoichiometric form), for example, cadmium oxide, with a medium in which it is insoluble, for example, glycerol, oil or water; (2) adding to the mixture so obtained a substance soluble in the said medium, for example, gelatine; (3) milling into a paste to obtain dispersion of the compound; (4) printing or otherwise depositing the said paste on an insulating base, for example, resin-impregnated paper, and drying. The process may be modified by making the initial mixture consist of the stated medium and a mixture of two or more compounds, for example, cadmium oxide and zinc oxide, or making the initial mixture consist of the stated medium and a solid solution of two or more compounds, for example calcium oxide in cadmium oxide. The invention provides a resistor particularly suitable for inclusion in printed circuits and a preferred form of such circuit is as disclosed in Specification 651,780. In one embodiment cadmium carbonate is heated at 450‹ C. for 1 hour in air and the resulting cadmium oxide mixed into a paste with glycerol thickened with gelatine and milled until the oxide is completely dispersed and a wetting- agent of the form disclosed in Specification 675,753 is then added. The resistance ink thus prepared is printed on the insulating base and dried. The assembly may then be subjected to an applied pressure to reduce the resistivity of the deposit. In a further embodiment a mixture of cadmium oxide and zinc oxide is milled with paraffin oil and stearic acid then added to produce a smooth cream.
GB3109647A 1947-11-24 1947-11-24 Improvements in or relating to electrical resistors Expired GB675752A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB3109647A GB675752A (en) 1947-11-24 1947-11-24 Improvements in or relating to electrical resistors
FR975301D FR975301A (en) 1947-11-24 1948-11-19 Electrical resistors and manufacturing processes
NL143475A NL77160C (en) 1947-11-24 1948-11-23
BE485966D BE485966A (en) 1947-11-24 1948-12-24

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3109647A GB675752A (en) 1947-11-24 1947-11-24 Improvements in or relating to electrical resistors

Publications (1)

Publication Number Publication Date
GB675752A true GB675752A (en) 1952-07-16

Family

ID=10317902

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3109647A Expired GB675752A (en) 1947-11-24 1947-11-24 Improvements in or relating to electrical resistors

Country Status (4)

Country Link
BE (1) BE485966A (en)
FR (1) FR975301A (en)
GB (1) GB675752A (en)
NL (1) NL77160C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984002048A1 (en) * 1982-11-12 1984-05-24 Wolfgang Bronnvall Self-limiting heater and resistance material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984002048A1 (en) * 1982-11-12 1984-05-24 Wolfgang Bronnvall Self-limiting heater and resistance material
US4629869A (en) * 1982-11-12 1986-12-16 Bronnvall Wolfgang A Self-limiting heater and resistance material

Also Published As

Publication number Publication date
NL77160C (en) 1955-02-15
FR975301A (en) 1951-03-05
BE485966A (en) 1949-05-28

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