Patent US433180A successfully refreshed from Google Patents.
Patent US181514A successfully refreshed from Google Patents.
Patent US5093545A successfully refreshed from Google Patents.
US5093545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method, system and composition for soldering by induction heating
Assignee: Delaware Capital Formation Inc
•
Filing: 1990-01-16
•
Granted: 1992-03-03
•
Expires: 2010-01-16
Abstract
Abstract This invention provides a method for soldering using induction heating, which is accomplished by the use of lossy heating particles in or on the solder. The method of this invention provides direct heating of the solder itself through induction heating of the magnetic particles in an alternating magnetic field. The magnetic particles useful in this invention can be ferromagnetic particles or ferrimagnetic particles, preferably ferrites, which have a Curie temperature at least equal to the flow temperature of the solder. Selection of the magnetic lossy heating particles with the appropriate Curie temperature for the system in which the particles are being used provides a system in which the temperature is self-regulating when the alternating magnetic field is applied. This self-regulation feature prevents overheating of the solder in the articles being soldered. The invention also discloses the selection of particles with surface properties whereby the particles can either be wetted by the solder and remain in the solder when the solder flows or it can be nonwettable by the solder whereby the particles separate from the solder when the solder flows. The surface properties can also be provided by coatings on the particles. This invention also discloses solder compositions comprising solder and lossy heating particles which produce the desired heat in an alternating magnetic field. The invention also provides systems and assemblies for the use of the above method and composition.
Inventors
- 👤 Thomas H. McGaffigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:23
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/34; B29C65/36; B29C65/3604; B29C65/3608; B29C65/3612; B29C61/00; B29C61/06; B29C61/0608; B29C61/0625; B29C65/366; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/114; B29C66/1142; B29C66/50; B29C66/51; B29C66/52; B29C66/526; B29C66/53; B29C66/532; B29C66/5324; B29C66/53245; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91411; B29C66/91431; B29C66/9161; B29C66/91651; B29C66/919; H; H01; H01R; H01R4/00; H01R4/70; H01R4/72; H01R4/723; B23; B23K; B23K35/00; B23K35/02; B23K35/0222; B23K35/0244; B23K35/025; B29C65/3668; B29C66/91655; B29C66/94; B29C66/949; H01R43/00; H01R43/02; H01R43/0207; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3465; H05K3/3485; H05K3/3494
Claims Analysis
Total Claims: 70
Claim 1
Independent Claim
126 words
A method for soldering an article comprising: placing on the article a composition comprising in combination a solder material and lossy heating particles in thermal contact with the solder material which particles have a Curie temperature at least equal to the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field, wherein the lossy heating particles (a) comprise ferrimagnetic particles or (b) comprise ferromagnetic particles and nonlossy particles having high permeability and being capable of providing magnetic circuit coupling through the ferromagnetic lossy heating particles; and subjecting the article and the composition to an alternating magnetic field to cause the lossy heating particles to heat the solder to its flow temperature.
Claim 2
Independent Claim
126 words
A method for soldering an article comprising: placing on the article a composition comprising in combination a solder material and lossy heating particles in thermal contact with the solder material which particles have a Curie temperature at least equal to the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field, wherein the lossy heating particles (a) comprise ferrimagnetic particles or (b) comprise ferromagnetic particles and nonlossy particles having high permeability and being capable of providing magnetic circuit coupling through the ferromagnetic lossy heating particles; and subjecting the article and the composition to an alternating magnetic field to cause the lossy heating particles to heat the solder to its flow temperature.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein the lossy heating particles are dispersed in the solder material.
Claim 4
Dependent Claim
14 words
A method according to claim 1 wherein the solder material comprises a solder paste.
Claim 5
Dependent Claim
13 words
A method according to claim 2 wherein the solder material comprises solder paste.
Claim 6
Dependent Claim
16 words
A method according to claim 1 wherein the lossy heating particles comprise a layer of particles.
Claim 7
Dependent Claim
21 words
A method according to claim 5 wherein the layer of lossy heating particles is on the surface of the solder material.
Claim 8
Dependent Claim
14 words
A method according to claim 6 wherein the lossy heating particles comprise ferrite particles.
Claim 9
Dependent Claim
14 words
A method according to claim 1 wherein the lossy heating particles comprise ferrite particles.
Claim 10
Dependent Claim
22 words
A method according to claim 8 wherein the lossy heating particles comprise ferrite particles having a conductive coating on the surface thereof.
Claim 11
Dependent Claim
26 words
A method according to claim 1 wherein the lossy heating particles are such that the surface thereof is wetted by the solder when the solder flows.
Claim 12
Dependent Claim
27 words
A method according to claim 1 wherein the lossy heating particles are such that the surface thereof is not wetted by the solder when the solder flows.
Claim 13
Dependent Claim
32 words
A method according to claim 1 wherein the ferrimagnetic particles further comprise nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling through the ferrimagnetic lossy heating particles.
Claim 14
Dependent Claim
33 words
A method according to claim 1 wherein the article comprises a heat recoverable member and wherein the heat produced by the lossy heating particles at least in part causes the member to recover.
Claim 15
Dependent Claim
49 words
A solder composition comprising in combination a solder material and ferrimagnetic lossy heating particles which have a Curie temperature at least equal to the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field.
Claim 16
Dependent Claim
49 words
A solder composition comprising in combination a solder material and ferrimagnetic lossy heating particles which have a Curie temperature at least equal to the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field.
Claim 17
Dependent Claim
16 words
A composition according to claim 14 wherein the lossy heating particles are dispersed in the solder.
Claim 18
Dependent Claim
12 words
A composition according to claim 15 wherein the solder comprises solder paste.
Claim 19
Dependent Claim
12 words
A composition according to claim 14 wherein the solder comprises solder paste.
Claim 20
Dependent Claim
16 words
A composition according to claim 14 wherein the lossy heating particles comprise a layer of particles.
Claim 21
Dependent Claim
14 words
A composition according to claim 14 wherein the lossy heating particles comprise ferrite particles.
Claim 22
Dependent Claim
19 words
A composition according to claim 14 wherein the lossy heating particles comprise a conductive coating on the surface thereof.
Claim 23
Dependent Claim
33 words
A composition according to claim 14 comprising nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling when the lossy heating particles are at or near their Curie temperature.
Claim 24
Dependent Claim
26 words
A composition according to claim 14 wherein the lossy heating particles are such that the surface thereof is wetted by the solder when the solder flows.
Claim 25
Dependent Claim
27 words
A composition according to claim 14 wherein the lossy heating particles are such that the surface thereof is not wetted by the solder when the solder flows.
Claim 26
Dependent Claim
93 words
A solder composition comprising in combination (a) a solder material, (b) ferromagnetic lossy heating particles which have a Curie temperature in the range between about the flow temperature of the solder and up to about 300° C. above the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field and (c) nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling when the ferromagnetic lossy heating particles are at or near their Curie temperature.
Claim 27
Dependent Claim
93 words
A solder composition comprising in combination (a) a solder material, (b) ferromagnetic lossy heating particles which have a Curie temperature in the range between about the flow temperature of the solder and up to about 300° C. above the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field and (c) nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling when the ferromagnetic lossy heating particles are at or near their Curie temperature.
Claim 28
Dependent Claim
16 words
A composition according to claim 24 wherein the lossy heating particles are dispersed in the solder.
Claim 29
Dependent Claim
12 words
A composition according to claim 25 wherein the solder comprises solder paste.
Claim 30
Dependent Claim
12 words
A composition according to claim 24 wherein the solder comprises solder paste.
Claim 31
Dependent Claim
16 words
A composition according to claim 24 wherein the lossy heating particles comprise a layer of particles.
Claim 32
Dependent Claim
19 words
A composition according to claim 24 wherein the lossy heating particles comprise a nonconductive coating on the surface thereof.
Claim 33
Dependent Claim
111 words
An article suitable for connection to another article having deposited thereon at the point of connection a solder composition comprising in combination a solder material and lossy heating particles in thermal contact with the solder material which particles have a Curie temperature at least equal to the flow temperature of the solder wherein the lossy heating particles (a) comprise ferrimagnetic particles or (b) comprise ferromagnetic particles and nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling through the ferromagnetic lossy heating particles and wherein the lossy heating particles are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field.
Claim 34
Dependent Claim
111 words
An article suitable for connection to another article having deposited thereon at the point of connection a solder composition comprising in combination a solder material and lossy heating particles in thermal contact with the solder material which particles have a Curie temperature at least equal to the flow temperature of the solder wherein the lossy heating particles (a) comprise ferrimagnetic particles or (b) comprise ferromagnetic particles and nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling through the ferromagnetic lossy heating particles and wherein the lossy heating particles are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field.
Claim 35
Dependent Claim
18 words
An article according to claim 30 comprising a heat recoverable cover thereon adapted for recovering onto the article.
Claim 36
Dependent Claim
22 words
An article according to claim 31 wherein the heat recoverable cover comprises a layer of lossy heating particles on a surface thereof.
Claim 37
Dependent Claim
23 words
An article according to claim 32 wherein the layer of lossy heating particles is on the inside surface of the heat recoverable cover.
Claim 38
Dependent Claim
18 words
An article according to claim 30 wherein the solder composition is on the form of a solder ribbon.
Claim 39
Dependent Claim
18 words
An article according to claim 30 wherein the solder composition is in the form of a solder preform.
Claim 40
Dependent Claim
86 words
A cored solder wire comprising lossy heating particles in the core thereof wherein the lossy heating particles have a Curie temperature at least equal to the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field wherein the lossy heating particles (a) comprise ferrimagnetic particles or (b) comprise ferromagnetic particles and nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling through the ferromagnetic lossy heating particles.
Claim 41
Dependent Claim
86 words
A cored solder wire comprising lossy heating particles in the core thereof wherein the lossy heating particles have a Curie temperature at least equal to the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field wherein the lossy heating particles (a) comprise ferrimagnetic particles or (b) comprise ferromagnetic particles and nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling through the ferromagnetic lossy heating particles.
Claim 42
Dependent Claim
14 words
A cored solder wire according to claim 36 comprising a flux in the core.
Claim 43
Dependent Claim
21 words
A solder ribbon which comprises the cored solder wire of claim 36 which has been flattened to form a solder ribbon.
Claim 44
Dependent Claim
23 words
Solder preforms which comprise segments of the solder ribbon of claim 38 which have been cut and shaped to form a solder preform.
Claim 45
Dependent Claim
141 words
An autoregulating system for soldering an article comprising: an article suitable for connection to another article having deposited thereon at the point of connection a solder composition comprising in combination a solder material and lossy heating particles which have a Curie temperature at least equal to the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field wherein the lossy heating particles (a) comprise ferrimagnetic particles or (b) comprise ferromagnetic particles and nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling through the ferromagnetic lossy heating particles; an induction coil adapted to produce the magnetic field; and a power supply being adapted to provide power to the induction coil as alternating current at a preselected frequency effective for heating said particles.
Claim 46
Dependent Claim
141 words
An autoregulating system for soldering an article comprising: an article suitable for connection to another article having deposited thereon at the point of connection a solder composition comprising in combination a solder material and lossy heating particles which have a Curie temperature at least equal to the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field wherein the lossy heating particles (a) comprise ferrimagnetic particles or (b) comprise ferromagnetic particles and nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling through the ferromagnetic lossy heating particles; an induction coil adapted to produce the magnetic field; and a power supply being adapted to provide power to the induction coil as alternating current at a preselected frequency effective for heating said particles.
Claim 47
Dependent Claim
16 words
A system according to claim 40 wherein the power supply comprises a constant current power supply.
Claim 48
Dependent Claim
16 words
A system according to claim 40 wherein the lossy heating particles are dispersed in the solder.
Claim 49
Dependent Claim
12 words
A system according to claim 42 wherein the solder comprises solder paste.
Claim 50
Dependent Claim
12 words
A system according to claim 40 wherein the solder comprises solder paste.
Claim 51
Dependent Claim
16 words
A system according to claim 40 wherein the lossy heating particles comprise a layer of particles.
Claim 52
Dependent Claim
14 words
A system according to claim 40 wherein the lossy heating particles comprise ferrite particles.
Claim 53
Dependent Claim
19 words
A system according to claim 40 wherein the lossy heating particles comprise a conductive coating on the surface thereof.
Claim 54
Dependent Claim
39 words
A system according to claim 40 wherein the ferrimagnetic particles further comprise nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling when the ferrimagnetic lossy heating particles are at or near their Curie temperature.
Claim 55
Dependent Claim
26 words
A system according to claim 40 wherein the lossy heating particles are such that the surface thereof is wetted by the solder when the solder flows.
Claim 56
Dependent Claim
27 words
A system according to claim 40 wherein the lossy heating particles are such that the surface thereof is not wetted by the solder when the solder flows.
Claim 57
Dependent Claim
22 words
A system according to claim 40 wherein the article comprises a heat recoverable member which is heated by the lossy heating particles.
Claim 58
Dependent Claim
150 words
An assembly comprising: an induction coil adapted to produce a magnetic field; an article suitable for connection to another article having deposited thereon at the point of connection a solder composition comprising in combination a solder material and lossy heating particles which have a Curie temperature at least equal to the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field positioned in said alternating magnetic field wherein the lossy heating particles (a) comprise ferrimagnetic particles or (b) comprise ferromagnetic particles and nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling through the ferromagnetic lossy heating particles; and a power supply connected to said induction coil, said power supply being adapted to provide power to the induction coil as alternating current at a preselected frequency effective for heating said particles.
Claim 59
Dependent Claim
150 words
An assembly comprising: an induction coil adapted to produce a magnetic field; an article suitable for connection to another article having deposited thereon at the point of connection a solder composition comprising in combination a solder material and lossy heating particles which have a Curie temperature at least equal to the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field positioned in said alternating magnetic field wherein the lossy heating particles (a) comprise ferrimagnetic particles or (b) comprise ferromagnetic particles and nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling through the ferromagnetic lossy heating particles; and a power supply connected to said induction coil, said power supply being adapted to provide power to the induction coil as alternating current at a preselected frequency effective for heating said particles.
Claim 60
Dependent Claim
16 words
An assembly according to claim 52 wherein the power supply comprises a constant current power supply.
Claim 61
Dependent Claim
16 words
An assembly according to claim 52 wherein the lossy heating particles are dispersed in the solder.
Claim 62
Dependent Claim
12 words
An assembly according to claim 54 wherein the solder comprises solder paste.
Claim 63
Dependent Claim
12 words
An assembly according to claim 52 wherein the solder comprises solder paste.
Claim 64
Dependent Claim
16 words
An assembly according to claim 52 wherein the lossy heating particles comprise a layer of particles.
Claim 65
Dependent Claim
14 words
An assembly according to claim 52 wherein the lossy heating particles comprise ferrite particles.
Claim 66
Dependent Claim
19 words
An assembly according to claim 52 wherein the lossy heating particles comprise a conductive coating on the surface thereof.
Claim 67
Dependent Claim
39 words
An assembly according to claim 52 wherein the ferrimagnetic particles further comprise nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling when the ferrimagnetic lossy heating particles are at or near their Curie temperature.
Claim 68
Dependent Claim
26 words
An assembly according to claim 52 wherein the lossy heating particles are such that the surface thereof is wetted by the solder when the solder flows.
Claim 69
Dependent Claim
27 words
An assembly according to claim 52 wherein the lossy heating particles are such that the surface thereof is not wetted by the solder when the solder flows.
Claim 70
Dependent Claim
22 words
An assembly according to claim 52 wherein the article comprises a heat recoverable member which is heated by the lossy heating particles.
References Cited (Backward Citations)
US1975436A
Cited
US1975437A
Cited
US2393541A
Cited
US3391846A
Cited
US3548140A
Cited
US3902940A
Cited
US3923580A
Cited
US3900153A
Cited
US4035547A
Cited
US4107506A
Cited
US4290195A
Cited
US4327265A
Cited
US4431891A
Cited
US4256945A
Cited
US4695713A
Cited
US4914267A
Cited
US4659912A
Cited
US4665309A
Cited
US4771151A
Cited
US4795870A
Cited
US4788404A
Cited
US4642442A
Cited
US4789767A
Cited
US4749833A
Cited
US4852252A
Cited
US4987283A
Cited
US4983804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-03 | 1995-09-02 | 1996-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-03 | 1999-09-02 | 2000-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-03 | 2003-09-02 | 2004-03-03 | $7700.00 | Window Closed / Lapsed |