Patent EP0061550A2 successfully refreshed from Google Patents.
EP0061550A2
Expired / Lapsed
EP
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Glass coated disk thermistor
Assignee: Yellow Springs Instrument Co Inc
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Filing: 1981-10-14
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Granted: —
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Expires: 2001-10-14
Abstract
Abstract A tri-metal contact film (31, 33) of silver, platinum, and palladium is metallurgically bonded to the opposite surfaces of a disk (11) of dense, controlled temperature coefficient of resistance thermistor material. The disk is trimmed to the desired electrical dimensions and a silver-clad wire (61,63) is fusion welded by thermal compression bonding to the contact film (31, 33) on each side of the disk. The method of making electrical contact allows the assembly to be encased in a conformal glass coating (75). The glass coating (75) provides an enchanced stability thermistor having predetermined characteristics.
Inventors
- 👤 Thomas Herbert Lamers
- 👤 John Michel Zurbuchen
- 👤 Hardy Wilcox Trolander
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 04:08
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
135 words
A glass coated disk thermistor comprising: a disk (11) of thermistor material having an upper surface (13) and a lower surface (15); a film (31, 33) of a mixture of finely divided silver, platinum, and palladium metallurgically bonded to said upper surface (13) and to said lower surface (15) of said disk (11); a first wire lead (61) having a silver surface; a second wire lead (63) having a silver surface; means attaching in fusion relationship said first wire lead (61) to said film (31) on the disk upper surface (13) and attaching in fusion relationship said second wire lead (63) to said film (33) on the disk lower surface (15); and a glass coating (75) conformally encapsulating said film coated disk and said wire leads where said leads are attached to said film-coated disk.
Claim 2
Dependent Claim
135 words
A glass coated disk thermistor comprising: a disk (11) of thermistor material having an upper surface (13) and a lower surface (15); a film (31, 33) of a mixture of finely divided silver, platinum, and palladium metallurgically bonded to said upper surface (13) and to said lower surface (15) of said disk (11); a first wire lead (61) having a silver surface; a second wire lead (63) having a silver surface; means attaching in fusion relationship said first wire lead (61) to said film (31) on the disk upper surface (13) and attaching in fusion relationship said second wire lead (63) to said film (33) on the disk lower surface (15); and a glass coating (75) conformally encapsulating said film coated disk and said wire leads where said leads are attached to said film-coated disk.
Claim 3
Independent Claim
120 words
The method of fabricating a thermistor comprising the steps of: compressing a powder mix of thermistor material into a pellet (11) having at least two spaced surface areas (13, 15); coating two spaced surface areas (13, 15) of said pellet with a metal paste (31, 33); heating the coated pellet to sinter the pellet and fuse the metal paste; preparing leads (61, 63),with ends having metal the same as in said metal paste; contacting lead ends to coated areas of said pellet; applying heat and pressure to said lead ends contacting the pellet thermo-compression welding the lead ends to said coated areas of pellet; and fusing a conformal glass coat (75) to the disk (11) and lead wires (61, 63).
Claim 4
Independent Claim
120 words
The method of fabricating a thermistor comprising the steps of: compressing a powder mix of thermistor material into a pellet (11) having at least two spaced surface areas (13, 15); coating two spaced surface areas (13, 15) of said pellet with a metal paste (31, 33); heating the coated pellet to sinter the pellet and fuse the metal paste; preparing leads (61, 63),with ends having metal the same as in said metal paste; contacting lead ends to coated areas of said pellet; applying heat and pressure to said lead ends contacting the pellet thermo-compression welding the lead ends to said coated areas of pellet; and fusing a conformal glass coat (75) to the disk (11) and lead wires (61, 63).
Claim 5
Dependent Claim
22 words
A method as claimed in Claim 2, wherein said powder mix comprises primarily an oxide of nickel and an oxide of manganese.
Claim 6
Dependent Claim
21 words
A method as claimed in Claim 2,wherein said metal paste is a thick film comprising finely divided silver, platinum, and palladium.
Claim 7
Dependent Claim
13 words
A method as claimed in Claim 4,wherein said leads have a silver surface.
Claim 8
Dependent Claim
63 words
A method as claimed in Claim 2,wherein said fusing a conformal glass coating to the disk and to the lead wire ends comprises coating the disk and lead ends with a glass frit and fusing the glass frit to the disk and lead wires at a temperature between approximately 500°C and approximately 600°C and for a time of approximately 1 to 2 minutes.
Claim 9
Dependent Claim
48 words
A method as claimed in Claim 2,wherein the fusing a conformal glass coating to the disk and lead wire ends comprises dipping said disk and lead wire ends in molten glass at a temperature of approximately 600°C to approximately 700°C for approximately 3 seconds to approximately 10 seconds.
Claim 10
Dependent Claim
31 words
A method as claimed in Claim 2,wherein the fusing a conformal glass coating to the disk and lead wire ends comprises flame spraying glass over said disk and lead wire ends.
Claim 11
Independent Claim
185 words
The method of fabricating a glass coated disk thermistor comprising the steps of: compressing a resinated powder mix compris- .ing primarily metallic oxides into a disk (11) having an upper surface (13) and a lower surface (15); coating said upper surface (13) and said lower surface (15) of the disk with a thick film (31, 33) comprising finely divided silver, platinum, and palladium; heating said film-coated disk to a temperature of approximately 625°C at a rise of approximately 15°C per minute; sintering said fired, coated, disk at a temperature of approximately 1200°C for approximately 3 hours; removing said disk from the sintering temperature and cooling said disk; preparing an end region of a first (61) and of a second wire lead (63) each wire lead having a silver surface; welding a portion of said end region of first wire lead (61) to said coated upper disk surface (31) and welding a portion of said end region of second wire lead (63) to said coated disk lower surface (33); and > fusing a conformal glass coat (75) to the coated disk and wire lead end regions.
Claim 12
Independent Claim
185 words
The method of fabricating a glass coated disk thermistor comprising the steps of: compressing a resinated powder mix compris- .ing primarily metallic oxides into a disk (11) having an upper surface (13) and a lower surface (15); coating said upper surface (13) and said lower surface (15) of the disk with a thick film (31, 33) comprising finely divided silver, platinum, and palladium; heating said film-coated disk to a temperature of approximately 625°C at a rise of approximately 15°C per minute; sintering said fired, coated, disk at a temperature of approximately 1200°C for approximately 3 hours; removing said disk from the sintering temperature and cooling said disk; preparing an end region of a first (61) and of a second wire lead (63) each wire lead having a silver surface; welding a portion of said end region of first wire lead (61) to said coated upper disk surface (31) and welding a portion of said end region of second wire lead (63) to said coated disk lower surface (33); and > fusing a conformal glass coat (75) to the coated disk and wire lead end regions.
Claim 13
Dependent Claim
18 words
A method as claimed in Claim 9,wherein said resinated powder mix comprises primarily nickel oxide and manganese oxide.
Claim 14
Dependent Claim
21 words
A method as claimed in Claim 10,wherein said cooling of the disk is at a rate of approximately 200°C per second.
Claim 15
Dependent Claim
30 words
A method as claimed in Claim 11,wherein said welding is a fusion formed by a contact temperature of approximately 600°C and a pressure of approximately 140 kilograms per square centimeter.
Claim 16
Dependent Claim
20 words
A method as claimed in Claim 12 wherein said finely divided silver, platinum, and palladium are in an organic vehicle.
Claim 17
Dependent Claim
66 words
A method as claimed in Claim 13,wherein the fusing of said conformal glass coat (75) comprises coating the coated disk and welded end regions of said wire leads with a low melting temperature glass frit and fusing said glass frit to the coated disk (11) and wire leads (61, 63) at a temperature between approximately 500°C and approximately 600°C for approximately one to approximately two minutes.
Claim 18
Dependent Claim
51 words
A method as claimed in Claim 13,wherein the fusing a conformal glass coating (75) to the disk and wire lead end regions comprises dipping said disk and lead wire end regions in molten glass at a temperature of approximately 600°C to approximately 700°C for approximately 3 seconds to approximately 10 seconds.
Claim 19
Dependent Claim
34 words
A method as claimed in Claim 13 wherein the fusing a conformal glass coating (75) to the disk and wire end regions comprises flame spraying glass over said disk and wire lead end regions.
Claim 20
Independent Claim
91 words
The method of fabricating a stable disk thermistor having a predetermined resistance characteristic comprising the steps of: coating the flat surfaces (13, 15) of a disk (11) of pressed thermistor material with a noble metal film (31, 33) containing finely divided silver; sintering said coating to said disk; measuring the resistance of said disk; removing a portion of said coated disk to provide said predetermined resistance; welding leads (61, 63) containing silver to said coated flat surfaces (31, 33); and fusing a conformal glass coating (75) to said disk and leads.
Claim 21
Independent Claim
91 words
The method of fabricating a stable disk thermistor having a predetermined resistance characteristic comprising the steps of: coating the flat surfaces (13, 15) of a disk (11) of pressed thermistor material with a noble metal film (31, 33) containing finely divided silver; sintering said coating to said disk; measuring the resistance of said disk; removing a portion of said coated disk to provide said predetermined resistance; welding leads (61, 63) containing silver to said coated flat surfaces (31, 33); and fusing a conformal glass coating (75) to said disk and leads.
Claim 22
Independent Claim
148 words
The method of fabricating a glass coated thermistor having a predetermined resistance characteristic comprising the steps of: compressing a powder mix of thermistor material into a pellet (11) having at least two spaced surface areas (13, 15); coating two spaced surface areas of said pellet with a metal paste (31, 33); heating the coated pellet to sinter the thermister material and adhere the metal coat; removing a portion of said coated disk to obtain said predetermined resistance; preparing a first lead (61) and a second' lead (63) with each lead having an end having metal the same as in said metal paste; positioning a said prepared lead end in contacting relationship on each coated area (31, 33) of said pellet; applying heat and pressure to weld each said lead end to its respective contacting coated area; and fusing a conformal glass coating (75) to the disk and leads.
Claim 23
Independent Claim
148 words
The method of fabricating a glass coated thermistor having a predetermined resistance characteristic comprising the steps of: compressing a powder mix of thermistor material into a pellet (11) having at least two spaced surface areas (13, 15); coating two spaced surface areas of said pellet with a metal paste (31, 33); heating the coated pellet to sinter the thermister material and adhere the metal coat; removing a portion of said coated disk to obtain said predetermined resistance; preparing a first lead (61) and a second' lead (63) with each lead having an end having metal the same as in said metal paste; positioning a said prepared lead end in contacting relationship on each coated area (31, 33) of said pellet; applying heat and pressure to weld each said lead end to its respective contacting coated area; and fusing a conformal glass coating (75) to the disk and leads.
Claim 24
Dependent Claim
22 words
A method as claimed in Claim 18 wherein said powder mix comprises primarily an oxide of nickel and an oxide of manganese.
Claim 25
Dependent Claim
22 words
A method as claimed in Claim 18 wherein said metal paste is a thick film comprising finely divided silver, platinum, and palladium.
Claim 26
Dependent Claim
14 words
A method as claimed in Claim 18 wherein said leads have a silver surface.
Claim 27
Dependent Claim
29 words
A method as claimed in Claim 18 wherein said conformal glass coating comprises coating said disk and lead ends with a glass frit and heating to fuse the frit.
Claim 28
Dependent Claim
33 words
A method as claimed in Claim 18 wherein said heating the coated pellet to sinter the thermistor material and adhere the metal coating is at a temperature of approximately 800°C to approximately 1500°C.
Claim 29
Independent Claim
102 words
The method of fabricating a thermistor from a disk (11) having an upper surface (13) and a lower surface (15), of densely compacted thermistor material comprising the steps of: coating said upper and lower surfaces (13, 15) of said disk (11) of compacted thermistor material with a film (31, 33) containing silver; heating said coated disk sintering the thermistor material and fusing said film to the disk; thermo-compression bonding the ends of lead wires (61, 63) containing silver to said surfaces; and fusing a conformal glass coat (75) over said disk (11) and said bonded ends of said lead wires (61, 63).
Claim 30
Independent Claim
102 words
The method of fabricating a thermistor from a disk (11) having an upper surface (13) and a lower surface (15), of densely compacted thermistor material comprising the steps of: coating said upper and lower surfaces (13, 15) of said disk (11) of compacted thermistor material with a film (31, 33) containing silver; heating said coated disk sintering the thermistor material and fusing said film to the disk; thermo-compression bonding the ends of lead wires (61, 63) containing silver to said surfaces; and fusing a conformal glass coat (75) over said disk (11) and said bonded ends of said lead wires (61, 63).
References Cited (Backward Citations)
No citation records indexed.
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