US5284286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous metal block for removing solder or braze from a substate and a process for making the same
Assignee: International Business Machines Corp
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Filing: 1991-10-31
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Granted: 1994-02-08
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Expires: 2011-10-31
Abstract
Abstract A porous metal block for selectively removing solder or braze from a substrate is disclosed. The block comprises a plurality of protrusions which absorb solder or braze through capillary action. The number and dimensions of the protrusions vary depending on the application. Also disclosed is a process for making such a block involving a unique two steps sintering process.
Inventors
- 👤 Peter J. Brofman
- 👤 Shaji Farooq
- 👤 Kathleen A. Lidestri
- 👤 Gregg B. Monjeau
- 👤 Karl J. Puttlitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:07
CPC Classifications
B; B23; B23K; B23K3/00; B23K3/08; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F2998/00; B22F2999/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
40 words
A structure for the selective removal of solder or braze from a substrate comprising, a porous metal block, said block having at least one surface having at least one porous protrusion for the selective absorption of said solder or braze.
Claim 2
Dependent Claim
40 words
A structure for the selective removal of solder or braze from a substrate comprising, a porous metal block, said block having at least one surface having at least one porous protrusion for the selective absorption of said solder or braze.
Claim 3
Dependent Claim
37 words
The structure of claim 1, wherein the material for said porous metal block is selected from a group comprising copper, nickel, nickel-based alloys, and copper-based alloys or any other metal that is wettable by solder or braze.
Claim 4
Dependent Claim
25 words
The structure of claim 1, wherein said protrusion is selected from a group comprising rectangular protrusion, circular protrusion, polygonal protrusion or any irregular shaped protrusion.
Claim 5
Dependent Claim
30 words
The structure of claim 1, wherein said surface having said protrusion is coated with a compatible material, wherein said compatible material is a material that wets said porous metal block.
Claim 6
Dependent Claim
13 words
The structure of claim 4, wherein said compatible material is a low-melting solder.
Claim 7
Dependent Claim
48 words
The structure of claim 1, wherein at least a portion of at least one said protrusion that comes in physical contact with said solder or braze on said substrate is coated with a compatible material, wherein said compatible material is a material that wets said porous metal block.
Claim 8
Dependent Claim
13 words
The structure of claim 6, wherein said compatible material is a low-melting solder.
Claim 9
Dependent Claim
16 words
The structure of claim 1, wherein at least one of said protrusions has a tapered profile.
Claim 10
Dependent Claim
11 words
The structure of claim 1, wherein said structure has interconnected porosity.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-07 | 1997-08-09 | 1998-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-07 | 2001-08-09 | 2002-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-07 | 2005-08-09 | 2006-02-08 | $7700.00 | Window Closed / Lapsed |