Patent US4731130A successfully refreshed from Google Patents.
US4731130A
Expired / Lapsed
US
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Soldering composition
Assignee: General Dynamics Government Systems Corp
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Filing: 1987-05-27
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Granted: 1988-03-15
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Expires: 2007-05-27
Abstract
Abstract A solder paste contains solder plated copper spheres in addition to particulate solder and flux. The paste can be used to solder leadless component carriers or the like to printed circuit boards., After melting the solder, the copper spheres are embedded in the resulting solder matrix, offsetting the carrier from the printed circuit board.
Inventors
- 👤 Daniel J. O'Leary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:50
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/341; H05K3/3431; H05K3/3442; B; B23; B23K; B23K35/00; B23K35/02; B23K35/0222; B23K35/0244; H05K3/3465; H05K3/3485; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0215; H05K2201/10; H05K2201/10227; H05K2201/10234; H05K2201/10613; H05K2201/10621; H05K2201/10727; H10; H10W; H10W72/00; H10W72/071; H10W72/072; H10W72/07221; H10W72/07227; H10W72/20; H10W72/281; H10W72/285; Y; Y02; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
30 words
A soldering composition suitable for soldering leadless component carriers and to provide an offset to printed circuit boards, comprising: (a) particulate solder; (b) flux; and (c) solder plated copper powder.
Claim 2
Dependent Claim
30 words
A soldering composition suitable for soldering leadless component carriers and to provide an offset to printed circuit boards, comprising: (a) particulate solder; (b) flux; and (c) solder plated copper powder.
Claim 3
Dependent Claim
25 words
The composition of claim 1 wherein said copper powder is in the form of copper spheres in the range of -60 sieve to +180 sieve.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |