US3933615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid flow stripping and plating system
Assignee: United States Department of the Air Force
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Filing: 1969-06-09
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Granted: 1976-01-20
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Expires: 1989-06-09
Abstract
Abstract The system comprises at least one device which includes an electrode and a fluid cavity both extending the longitudinal length of the circuit board adjacent to the portion of the board involved. Ordinarily, the terminal contacts along one edge of the board are to be stripped of, for example, tin-lead solder or plated with, for example, gold. The portion of the board to be plated or stripped, is made the other electrode. The electrode of the device is spaced from the contacts so that the fluid from the cavity flows evenly over the surface of the contact pads. Current passes from the electrode through the fluid to the board surface to either strip or plate, depending on the application of the system. The polarities of the electrodes are reversed for plating and stripping and the solution is changed.
Inventors
- 👤 Elliott R. Levenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:58
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/24; H05K3/241; C; C25; C25D; C25D5/00; C25D5/08; C25F; C25F5/00; C25D5/04; C25D5/06; H05K3/02; H05K3/06; H05K3/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
256 words
A fluid flow stripping and plating system for removable circuit boards and having a fluid source containing a fluid therein, comprising in combination: Electrical contact means for connection to a removable circuit board having terminal contacts adapted to be energized with a voltage of one polarity; First cavity means having a first opening therein said first opening being in a side of the first cavity means; A first electrode connected to said first cavity means and extending the length of said first cavity means; Means for spacing said first cavity means from said circuit board for permitting said fluid to flow from the first opening between said first electrode and said circuit board and across said terminal contacts when said circuit board is inserted in said system; A second cavity means having a second opening therein, said second opening being in a side of said second cavity means and having a length of at least equal to that of said first cavity means; A second electrode connected to said second cavity means and extending the length of said second cavity means; said first and second electrodes being adapted to be energized with a voltage of the opposite polarity; and A second means for spacing said second cavity means from said circuit board for permitting said fluid to flow from the second opening between said second electrode and said circuit board and across said terminal contacts when said circuit board is interposed between said first and second electrodes, said first and second electrodes being composed of carbon.
Claim 2
Dependent Claim
256 words
A fluid flow stripping and plating system for removable circuit boards and having a fluid source containing a fluid therein, comprising in combination: Electrical contact means for connection to a removable circuit board having terminal contacts adapted to be energized with a voltage of one polarity; First cavity means having a first opening therein said first opening being in a side of the first cavity means; A first electrode connected to said first cavity means and extending the length of said first cavity means; Means for spacing said first cavity means from said circuit board for permitting said fluid to flow from the first opening between said first electrode and said circuit board and across said terminal contacts when said circuit board is inserted in said system; A second cavity means having a second opening therein, said second opening being in a side of said second cavity means and having a length of at least equal to that of said first cavity means; A second electrode connected to said second cavity means and extending the length of said second cavity means; said first and second electrodes being adapted to be energized with a voltage of the opposite polarity; and A second means for spacing said second cavity means from said circuit board for permitting said fluid to flow from the second opening between said second electrode and said circuit board and across said terminal contacts when said circuit board is interposed between said first and second electrodes, said first and second electrodes being composed of carbon.
Claim 3
Dependent Claim
45 words
The combination recited in claim 1, wherein: said fluid source providing a supply of the fluid therefrom into either of said cavity means, either of said cavity means including means for removing bubbles from said openings, said openings having configurations for providing predetermined fluid pressure.
Claim 4
Dependent Claim
70 words
The combination recited in claim 1, including: means for connecting said first electrode to a voltage having one polarity and the portion of said circuit board adjacent to said first electrode to a voltage having another polarity for providing electrodes of opposite polarities for removing metal from the metallic portions of said circuit board when said fluid flows across the portion of the circuit board adjacent to said first electrode.
Claim 5
Dependent Claim
13 words
The combination recited in claim 1, wherein said fluid is a plating solution.
Claim 6
Dependent Claim
37 words
The combination recited in claim 1, wherein: at least one of said openings having a configuration for providing control of the pressure of said fluid so as to enable removal of material etched from said circuit board.
Claim 7
Dependent Claim
65 words
The combination recited in claim 1 wherein the first and second electrodes connected to the respective first and second cavity means adjacent the respective first and second openings, said first and second electrodes being configured as an extension to said first and second openings whereby the permitted flow is guided across said circuit board when the latter is interposed between said first and second electrodes.
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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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |