US5014420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fusing together metal particles using a high-frequency electromagnetic field
Assignee: XPC Inc
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Filing: 1989-07-11
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Granted: 1991-05-14
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Expires: 2009-07-11
Abstract
Abstract Micro-miniature particles of low resistivity material are fused by applying a highly concentrated high-frequency electromagnetic field to the particles. An electrially conductive printed circuit is formed by laying out a pattern of contiguous micr-miniature particles of low resistivity material and applying a highly concentrated high-frequency electromagnetic field to the particles to fuse them together to form a low resistance electrical conductive circuit.
Inventors
- 👤 Thomas A. Howard
- 👤 Donovan E. McGee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:12
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/102; H05K2203/00; H05K2203/10; H05K2203/101; H05K2203/11; H05K2203/1131; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49155
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
43 words
A method for forming low resistivity particles into an electrical circuit, comprising the steps of: generating an intense highly-concentrated high-frequency electromagnetic field and applying said field to the low resistivity particles layed out in an electrical circuit pattern for fusing the particles together.
Claim 2
Independent Claim
43 words
A method for forming low resistivity particles into an electrical circuit, comprising the steps of: generating an intense highly-concentrated high-frequency electromagnetic field and applying said field to the low resistivity particles layed out in an electrical circuit pattern for fusing the particles together.
Claim 3
Dependent Claim
18 words
The method as in claim 1 wherein the field is applied by moving it across the patterned particles.
Claim 4
Independent Claim
56 words
A method for making a low resistivity electrical circuit out of a multitude of miniature particles of low resistive material layed out in a contiguous electrical circuit pattern, comprising the steps of: generating a high-frequency electromagnetic field; concentrating the field to a narrow beam; and applying the concentrated field to the particles until they fuse together.
Claim 5
Independent Claim
56 words
A method for making a low resistivity electrical circuit out of a multitude of miniature particles of low resistive material layed out in a contiguous electrical circuit pattern, comprising the steps of: generating a high-frequency electromagnetic field; concentrating the field to a narrow beam; and applying the concentrated field to the particles until they fuse together.
Claim 6
Dependent Claim
22 words
The method as in claim 3 wherein the particles have a characteristic dimension that ranges from about forty-five to about seventy-five microns.
Claim 7
Dependent Claim
29 words
The method as in claim 4 wherein the concentrated field beam width ranges in the order of about one-half to about ten times the characteristic dimension of the particles.
Claim 8
Independent Claim
45 words
A method for forming a low resistivity electrical conductor, comprising the steps of: laying out a contiguous pattern of low resistivity miniature particles; generating a highly concentrated high frequency electro-magnetic field; and applying the concentrated electro-magnetic field to the particles until the particles fuse together.
Claim 9
Independent Claim
45 words
A method for forming a low resistivity electrical conductor, comprising the steps of: laying out a contiguous pattern of low resistivity miniature particles; generating a highly concentrated high frequency electro-magnetic field; and applying the concentrated electro-magnetic field to the particles until the particles fuse together.
Claim 10
Independent Claim
84 words
A method for making a low-resistance electrical circuit, comprising the steps of: (a) placing a multitude of miniature particles of electrically conductive material on a flat surface of a carrier comprising a thin sheet of electrically insulative material in a pattern corresponding to the desired electrical circuit; (b) generating an intense highly-concentrated high-frequency electro-magnetic field; and (c) applying the concentrated electro-magnetic field to the particles with the magnetic flux lines generally orthogonal to said flat surface of the carrier to fuse the particles together.
Claim 11
Independent Claim
84 words
A method for making a low-resistance electrical circuit, comprising the steps of: (a) placing a multitude of miniature particles of electrically conductive material on a flat surface of a carrier comprising a thin sheet of electrically insulative material in a pattern corresponding to the desired electrical circuit; (b) generating an intense highly-concentrated high-frequency electro-magnetic field; and (c) applying the concentrated electro-magnetic field to the particles with the magnetic flux lines generally orthogonal to said flat surface of the carrier to fuse the particles together.
Claim 12
Dependent Claim
29 words
The method for making an electrical circuit as described in claim 7 wherein the concentrated electro-magnetic field is applied to the underside of said flat surface of the carrier.
Claim 13
Dependent Claim
33 words
The method for making an electrical circuit as described in claim 7 wherein the concentrated electro-magnetic field is applied simultaneously to the topside and the underside of said flat surface of the carrier.
Claim 14
Independent Claim
33 words
The method for making an electrical circuit as described in claims 1, 3, 6 or 7 wherein the magnetic field is applied to the particles in a controlled atmosphere containing a reducing agent.
Claim 15
Dependent Claim
102 words
Apparatus for use in fusing together miniature metal particles, comprising: an electrical oscillator having a multiwinding air core coil for producing a high-intensity high-frequency electromagnetic field, said multiwinding coil comprising a thin sheet of electrically conductive metal wrapped around itself with each wrap insulated from the other wraps; a slab of electrically conductive material substantially closing off one end of the core; said slab having a very narrow opening therethrough for concentrating the electromagnetic field passing through the core into a very narrow beam; and means for applying said beam to a multitude of miniature metal particles to fuse together said particles.
Claim 16
Dependent Claim
102 words
Apparatus for use in fusing together miniature metal particles, comprising: an electrical oscillator having a multiwinding air core coil for producing a high-intensity high-frequency electromagnetic field, said multiwinding coil comprising a thin sheet of electrically conductive metal wrapped around itself with each wrap insulated from the other wraps; a slab of electrically conductive material substantially closing off one end of the core; said slab having a very narrow opening therethrough for concentrating the electromagnetic field passing through the core into a very narrow beam; and means for applying said beam to a multitude of miniature metal particles to fuse together said particles.
References Cited (Backward Citations)
US3491236A
Cited
DE2548243A1
Cited
SU742119A1
Cited
US4159414A
Cited
US4361114A
Cited
JPS60218826A
Cited
GB2160712A
Cited
US4788396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-13 | 1994-11-12 | 1995-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-13 | 1998-11-12 | 1999-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-13 | 2002-11-12 | 2003-05-14 | $7700.00 | Window Closed / Lapsed |