US4986462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for cleaning and/or fluxing circuit card assemblies
Assignee: Raytheon Co
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Filing: 1988-03-02
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Granted: 1991-01-22
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Expires: 2008-03-02
Abstract
Abstract Apparatus and a process are disclosed for cleaning and/or fluxing circuit card assemblies. The assemblies are moved through an enclosure in which they are sprayed with cleaning and/or fluxing liquid from fenestrated cylinders rotating above and below the path of the assemblies and disposed laterally thereacross. The complex spray impact pattern created by the simultaneous movements of the assemblies and the cylinders effects thorough cleaning and/or fluxing of the assemblies. Separate control of liquid pressure from the cylinders prevents unsoldered components from being dislodged from the assemblies during cleaning and or fluxing.
Inventors
- 👤 Gary L. Hethcoat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:35
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/20; B23K3/00; B23K3/08; B23K3/082; H; H05; H05K; H05K13/00; H05K13/04; H05K13/046; H05K13/0465; H05K3/00; H05K3/0085; B23K2101/00; B23K2101/36; B23K2101/40; H05K2203/00; H05K2203/07; H05K2203/0736; H05K2203/0746; H05K2203/15; H05K2203/1509; H05K2203/1572; H05K3/22; H05K3/26; H05K3/30; H05K3/32; H05K3/34; H05K3/3489
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
133 words
A process for cleaning or fluxing circuit card assemblies with a liquid which comprises; moving said assemblies through a substantially liquid-tight enclosure on a generally horizontal path extending from one end of said enclosure to the other end; spraying said assemblies with said liquid simultaneously from above and below said path while said assemblies move along said path, said sprays being dispensed from rotating dispensing means whose linear surface speed parallel to said path is greater than the speed of travel of said assemblies along said path such that the instantaneous angle at which the spray encounters said assemblies varies as a function of both the linear travel of the assemblies along said path and the rotation of said spray dispensing means, and, draining a substantial portion of said liquid from said assemblies.
Claim 2
Dependent Claim
133 words
A process for cleaning or fluxing circuit card assemblies with a liquid which comprises; moving said assemblies through a substantially liquid-tight enclosure on a generally horizontal path extending from one end of said enclosure to the other end; spraying said assemblies with said liquid simultaneously from above and below said path while said assemblies move along said path, said sprays being dispensed from rotating dispensing means whose linear surface speed parallel to said path is greater than the speed of travel of said assemblies along said path such that the instantaneous angle at which the spray encounters said assemblies varies as a function of both the linear travel of the assemblies along said path and the rotation of said spray dispensing means, and, draining a substantial portion of said liquid from said assemblies.
Claim 3
Dependent Claim
31 words
A process in claim 1 comprising cleaning said assemblies, wherein liquid is a cleaning liquid and contaminants dislodged from said assemblies by said cleaning liquid are removed in said drained liquid.
Claim 4
Dependent Claim
15 words
A process as in claim 2 wherein said cleaning liquid is a liquid fluorinated hydrocarbon.
Claim 5
Dependent Claim
20 words
A process in claim 1 comprising fluxing electrical contacts on said assemblies, wherein said liquid is a liquid soldering flux.
Claim 6
Dependent Claim
34 words
A process as in claim 1 comprising simultaneously cleaning said assemblies and the electrical contacts thereon and fluxing said contacts, wherein said liquid is a mixture of a cleaning liquid and a liquid flux.
Claim 7
Dependent Claim
27 words
A process as in claim 5 wherein said cleaning and fluxing are followed by a soldering step in which said electrical contacts on said assemblies are soldered.
Claim 8
Dependent Claim
23 words
A process as in claim 6 wherein said soldering step is followed by a second cleaning step to remove excess solder and flux.
Claim 9
Dependent Claim
133 words
A process as in claim 7 wherein said second cleaning step comprises moving said assemblies through a second substantially liquid-tight enclosure on a generally horizontal path extending from one end of said second enclosure to the other end; spraying said assemblies with a cleaning liquid simultaneously from above and below said path while said assemblies move along said path, said spray being dispensed from rotating dispensing means whose linear surface speed parallel to said path is greater than the speed of travel of said assemblies along said path such that the instantaneous angle at which spray encounters said assemblies varies as a function of both the linear travel of the assemblies along said path and the rotation of said spray dispensing means; and, draining said liquid from said assemblies and drying said assemblies.
Claim 10
Dependent Claim
20 words
A process as in claim 1 comprising cleaning said assemblies after said assemblies have had the electrical contacts thereon soldered.
References Cited (Backward Citations)
US721445A
Cited
US1561503A
Cited
US2322417A
Cited
US2347781A
Cited
US3190793A
Cited
US3082774A
Cited
US3101730A
Cited
US3298588A
Cited
US3224914A
Cited
US3266502A
Cited
US3291143A
Cited
US3536127A
Cited
US3603329A
Cited
US3616807A
Cited
US3689333A
Cited
US3865298A
Cited
US4589585A
Cited
US4769083A
Cited
US4767344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-21 | 1994-07-23 | 1995-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-21 | 1998-07-23 | 1999-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-21 | 2002-07-23 | 2003-01-22 | $7700.00 | Window Closed / Lapsed |