US5736074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of coated spheres
Assignee: Microfab Technologies Inc
•
Filing: 1995-06-30
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Granted: 1998-04-07
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Expires: 2015-06-30
Abstract
Abstract Solid spheres of substantially uniform size and shape and coated with a lower temperature melting material are formed for use in interconnect arrays, solder pastes, Z-axis conduction adhesives, etc. Drops of two materials are merged in flight forming a coating of the lower melting temperature material on the drop of higher melting temperature material.
Inventors
- 👤 Donald J. Hayes
- 👤 Mary W. Hartnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:08
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/006; B22; B22F; B22F1/00; B22F1/06; B22F1/065; B22F1/10; B22F1/102; B22F1/16; B22F1/18; B22F9/00; B22F9/02; B22F9/14; B23; B23K; B23K3/00; B23K3/06; B23K3/0607; B23K3/0623; B23K35/00; B23K35/02; B23K35/0222; B23K35/0244; B29; B29B; B29B9/00; B29B9/10; C; C23; C23C; C23C4/00; C23C4/12; C23C4/123; H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/321; H05K3/34; H05K3/341; H05K3/3431; H05K3/3436; H05K3/3465; H10; H10W; H10W70/00; H10W70/01; H10W70/05; H10W72/00; H10W72/20; H10W74/00; H10W74/01; H10W74/012; H10W74/10; H10W74/15; H10W90/00; H10W90/701; B23K2101/00; B23K2101/36; B23K2101/40; B23K35/025; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0218; H05K2201/03; H05K2201/0332; H05K2201/0364; H05K2201/0379; H05K2201/10; H05K2201/10227; H05K2201/10234; H05K2201/10613; H05K2201/10954; H05K2201/10977; H05K2201/10992; H05K2203/00; H05K2203/01; H05K2203/0104; H05K2203/013; H05K2203/04; H05K2203/041; H05K2203/0425; H05K3/10; H05K3/102; H10W72/01; H10W72/012; H10W72/01221; H10W72/01223; H10W72/01225; H10W72/01271; H10W72/071; H10W72/072; H10W72/07231; H10W72/07234; H10W72/07236; H10W72/073; H10W72/07331; H10W72/251; H10W72/252; H10W72/30; H10W72/321; H10W72/325; H10W72/351; H10W72/352; H10W72/851; H10W72/853; H10W72/856; Y; Y02; Y02P; Y02P70/00; Y02P70/50; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/4913
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
120 words
A method of making solid spheres of substantially uniform size and shape comprising the steps of: (a) forming a first stream of generally spherical drops of liquid first material in a line-of-flight between a first ejector and a collector; (b) forming a second stream of drops of a second material in a line-of-flight between an ejector and the line-of-flight of said first stream; (c) causing drops of said second material to collide with drops of said first material in said first line-of-flight and form unitary bodies of substantially uniform size and shape; (d) causing said unitary bodies to form substantially solid spheres while in said line-of-flight between said first ejector and a collector; and (e) collecting said substantially solid spheres.
Claim 2
Independent Claim
120 words
A method of making solid spheres of substantially uniform size and shape comprising the steps of: (a) forming a first stream of generally spherical drops of liquid first material in a line-of-flight between a first ejector and a collector; (b) forming a second stream of drops of a second material in a line-of-flight between an ejector and the line-of-flight of said first stream; (c) causing drops of said second material to collide with drops of said first material in said first line-of-flight and form unitary bodies of substantially uniform size and shape; (d) causing said unitary bodies to form substantially solid spheres while in said line-of-flight between said first ejector and a collector; and (e) collecting said substantially solid spheres.
Claim 3
Dependent Claim
35 words
A method as set forth in claim 1 wherein said streams of drops are formed by: (i) forcing a stream of liquid through an ejection device; and (ii) exciting said ejection device with electrical signals.
Claim 4
Dependent Claim
16 words
A method as set forth in claim 2 wherein said ejection device is an electro-mechanical device.
Claim 5
Dependent Claim
16 words
A method as set forth in claim 3 wherein said ejection device is a piezoelectric device.
Claim 6
Dependent Claim
30 words
A method as set forth in claim 1 including the step of causing drops of said liquid first material to substantially solidify before colliding with drops of said second material.
Claim 7
Dependent Claim
30 words
A method as set forth in claim 1 including the step of causing drops of said liquid second material to substantially solidify before colliding with drops of said first material.
Claim 8
Dependent Claim
44 words
A method as set forth in claim 1 including the step of maintaining sufficient heat energy in the drops of first material to cause the second material which collides therewith to form a liquid layer of uniform thickness on the drops of first material.
Claim 9
Dependent Claim
18 words
A method as set forth in claim 1 wherein said substantially solid spheres are collected in a container.
Claim 10
Dependent Claim
18 words
A method as set forth in claim 1 wherein said substantially solid spheres are deposited on a substrate.
Claim 11
Dependent Claim
22 words
A method as set forth in claim 1 wherein said substantially solid spheres are deposited on a substrate in a predetermined pattern.
Claim 12
Dependent Claim
17 words
A method as set forth in claim 10 wherein said predetermined pattern is a stack of spheres.
Claim 13
Dependent Claim
46 words
A method as set forth in claim 1 wherein said first material is selected from the group of aluminum, lead, tin, copper, gold, nickel, bismuth, gallium, silver, cobalt, cadmium, antimony, silicon, germanium, tellurium, indium and mixtures, solutions or alloys of two or more of such metals.
Claim 14
Dependent Claim
29 words
A method as set forth in claim 1 wherein first material has a melting temperature as least about 25° C. higher than the melting temperature of said second material.
Claim 15
Dependent Claim
40 words
A method as set forth in claim 1 wherein said first material is a first solder composition and said second material is a second solder composition having a melting temperature lower than the melting temperature of said first solder composition.
Claim 16
Dependent Claim
20 words
A method as set forth in claim 1 wherein said first material is solder and said second material is flux.
Claim 17
Dependent Claim
30 words
A method as set forth in claim 1 wherein said second material is selected from the group comprising flux, polymer, glass, wax, metals and mixtures, solutions or alloys of metals.
Claim 18
Dependent Claim
39 words
The method of claim 2 further comprising the step of mixing said substantially solid spheres into a carrier vehicle to produce a solder paste wherein said substantially solid spheres comprise at least about 80% by weight of said paste.
References Cited (Backward Citations)
US4426337A
Cited
US4355057A
Cited
US4801411A
Cited
JPH01176008A
Cited
US5063011A
Cited
US5053100A
Cited
US5153092A
Cited
US5229016A
Cited
US5193738A
Cited
US5377902A
Cited
US5411602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-04-06 | 2001-10-06 | 2002-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-06 | 2005-10-06 | 2006-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-06 | 2009-10-06 | 2010-04-07 | $7700.00 | Window Closed / Lapsed |