US4858820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desoldering aid and method
Assignee: Illinois Tool Works Inc
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Filing: 1987-02-18
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Granted: 1989-08-22
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Expires: 2007-02-18
Abstract
Abstract A technique is provided for desoldering circuit components employing a desoldering aid that fits like a cap on a standard size rectangular circuit component. The aid has a rectangular top of high thermal conductivity metal substantially the same size as the circuit component. At least a pair of integral sides along opposite edges of the top are bent normal to the top and are not further apart than the outside of the electrical leads on the opposite sides of the circuit component for good thermal contact therewith. The depth of the inside of the box is greater than the height of the top of the component so that there is no contact between the top of the box and the top of the component. The top of the box over the component is heated sufficiently to melt solder on the electrical leads. The box and component can then be lifted together from the printed circuit board.
Inventors
- 👤 George M. Kent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:32
CPC Classifications
H; H05; H05K; H05K13/00; H05K13/04; H05K13/0486; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3494; H05K2203/00; H05K2203/01; H05K2203/0195; H05K3/341; H05K3/3421
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
167 words
A desoldering aid for a standard size rectangular electronic circuit component having electrical leads protruding along sides of the component and soldered to a circuit board beneath the component comprising: a box of high thermal conductivity metal having a rectangular top, four rectangular sides approximately normal to the top and integral therewith, and no bottom; the inside width between opposite sides of the box being no greater than the outside width between electrical leads on opposite sides of the component so that the sides of the box contact the leads with at least sufficient force to support the weight of the component; the depth of the inside of the box being greater than the height of the top of the component above the circuit board so that there is no contact between the top of the box and the top of the component when the sides are against the circuit board; and a heat shield having a rectangular hole through which the sides of the box fit.
Claim 2
Dependent Claim
167 words
A desoldering aid for a standard size rectangular electronic circuit component having electrical leads protruding along sides of the component and soldered to a circuit board beneath the component comprising: a box of high thermal conductivity metal having a rectangular top, four rectangular sides approximately normal to the top and integral therewith, and no bottom; the inside width between opposite sides of the box being no greater than the outside width between electrical leads on opposite sides of the component so that the sides of the box contact the leads with at least sufficient force to support the weight of the component; the depth of the inside of the box being greater than the height of the top of the component above the circuit board so that there is no contact between the top of the box and the top of the component when the sides are against the circuit board; and a heat shield having a rectangular hole through which the sides of the box fit.
Claim 3
Dependent Claim
58 words
A desoldering aid for an electronic circuit component comprising: a rectangular metal conductor having a top and at least two opposite sides approximately normal to the top for conducting heat from the top through the sides to a component in the conductor; and a heat shield having a rectangular hole through which the sides of the conductor fit.
Claim 4
Dependent Claim
58 words
A desoldering aid for an electronic circuit component comprising: a rectangular metal conductor having a top and at least two opposite sides approximately normal to the top for conducting heat from the top through the sides to a component in the conductor; and a heat shield having a rectangular hole through which the sides of the conductor fit.
Claim 5
Dependent Claim
21 words
A desoldering aid as recited in claim 2 wherein there is an interference fit between the conductor and the heat shield.
Claim 6
Dependent Claim
18 words
A desoldering aid as recited in claim 2 wherein the conductor comprises wings for positioning the heat shield.
Claim 7
Dependent Claim
40 words
A desoldering aid for a standard size circuit component having electrical leads protruding from sides of the component comprising: a high thermal conductivity metal cap having sides no further apart than the outside distance between electrical leads on the component.
Claim 8
Dependent Claim
40 words
A desoldering aid for a standard size circuit component having electrical leads protruding from sides of the component comprising: a high thermal conductivity metal cap having sides no further apart than the outside distance between electrical leads on the component.
Claim 9
Dependent Claim
27 words
A desoldering aid as recited in claim 5 wherein the cap is rectangular and the four sides of the cap are not connected together at adjacent edges.
Claim 10
Dependent Claim
22 words
A desoldering aid as recited in claim 5 wherein the depth of the cap is greater than the height of the component.
Claim 11
Dependent Claim
19 words
A desoldering aid as recited in claim 5 comprising means for lifting the cap with a soldering iron tip.
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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) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |