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| The present invention is based upon the discoveries of the gene coding for the enzyme N-... |
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| DNA comprising regulatory regions from gene y of penicillium chrysogenum |
| What is claimed is: 1. An isolated DNA comprising a nucleotide sequence obtainable from gene Y ... |
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| High molecular weight collagen-like protein polymers |
| What is claimed is: 1. An unnatural collagen-like polymer of at least about 30 kD, characterized by:... |
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Thick film resistor paste and resistors therefrom
| Details |
Inventors: Yu, Ruey J.; Berg, Morris;
Assignee: General Motors Corporation (Detroit, MI)
Primary Examiner: Kyle; Deborah L.
Assistant Examiner: Barr; J. L.
Attorney, Agent or Firm: Carter; Sidney
This invention relates to resistor compositions comprising, in % by weight, about 5-24% RuO.sub.2, about 10-20% Ag, about 3-8% Sb.sub.2 O.sub.3, about 8-12% CdO, about 35 to 70% lead-borosilicate glass, up to about 4% Ta.sub.2 O.sub.5 and up to about 2% thermistor powder such as at least one of the transition metals Mn.sub.2 O.sub.3, NiO, CuO, Cr.sub.2 O.sub.3 and ZnO. These resistor compositions are adapted to be dispersed in a liquid vehicle to form a resistor ink or paste that can be applied to a surface of a ceramic substrate and fired to form a resistor having stable electrical and mechanical properties. |
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DETAILED DESCRIPTION The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1.
A resistor composition comprising, in weight %, about 35 to 70% lead-borosilicate glass and the following un-prereacted noble metal and metal oxides: silver in the amount of about 10-20%, about 5-24% RuO.
sub.
2, about 3-8% Sb.
sub.
2 O.
sub.
3, about 8-12% CdO, up to about 4% Ta.
sub.
2 O.
sub.
5 and up to about 2% of at least one thermistor powder selected from the group consisting of Cr.
sub.
2 O.
sub.
3, CuO, NiO, ZnO and Mn.
sub.
2 O.
sub.
3, said resistor composition being adapted to form fired resistors having stable electrical and physical properties.
2.
A resistor composition in weight % adapted to be applied to a ceramic substrate for firing at elevated temperatures to form a resistor having stable electrical and physical properties, said composition comprising about 18 to 20% Ag, about 14 to 24% RuO.
sub.
2, about 4 to 8% Sb.
sub.
2 O.
sub.
3, about 10 to 12% CdO, about 35 to 48% lead-borosilicate glass, up to about 4% Ta.
sub.
2 0.
sub.
5 and up to about 2% of at least one of the transition metal oxides selected from the group consisting of Cr.
sub.
2 O.
sub.
3, NiO, CuO, ZnO, and Mn.
sub.
2 O.
sub.
3, the metal oxides and silver being used without prereaction.
3.
A resistor composition in weight % adapted to be applied to a ceramic substrate for firing at elevated temperatures to form a resistor having stable electrical and physical properties, said composition comprising about 17 to 19% RuO.
sub.
2, about 18-19% Ag, about 4-5% Sb.
sub.
2 O.
sub.
3, about 10 to 12% CdO, about 44% lead-borosilicate glass, about 3-4% Ta.
sub.
2 O.
sub.
5 and about 0.
7-1% of a mixture of about 80% Mn.
sub.
2 O.
sub.
3, 17% NiO and 3% ZnO, the metal oxides and silver being used without pre-reaction.
4.
A resistor element having stable electrical and physical properties comprising an electrically non-conducting substrate having a resistance coating fired thereon at a peak temperature of from 700.
degree.
-900.
degree
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