Patent US3724418A successfully refreshed from Google Patents.
US3724418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solder coating apparatus
Assignee: Individual
•
Filing: 1971-08-20
•
Granted: 1973-04-03
•
Expires: 1991-08-20
Abstract
Abstract This invention, relating to the application of a thin uniform coat of hot tin lead solder to the exposed copper circuitry of electrical circuit boards utilizes a fluxing station, a standing wave soldering station, a hot liquid spray leveling station, a hot water spray cleaning station, a high volume air spray drying station and a conveyor for transporting the electrical circuit boards past the afore mentioned stations. The apparatus contains those pumps, motors, tanks, and electrical and hydraulic systems necessary to support the afore mentioned stations, more fully described in the drawing and in the body of the disclosure.
Inventors
- 👤 Lain J Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:40
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/08; B23K1/085; B23K1/012; B23K1/015; H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3465; H05K3/3468; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K2203/00; H05K2203/08; H05K2203/081; H05K2203/15; H05K2203/1509
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
The apparatus as described in claim 1 wherein the double rollers are arranged in an upper and a lower row, the rollers of the upper row directly above the rollers of the lower row in a one to one arrangement, with the surface of the upper roller touching the surface of the lower roller the rollers in the upper row being geared directly to the rollers in the lower row, so that when looking at the conveyor from the right hand side, after looking in the direction of travel of the board, when the lower roller is caused to turn in a clockwise direction, the upper roller will turn in a counter clockwise direction, causing a circuit board placed between the upper and lower rollers to tend to move along the conveyor or, as it were, through thE conveyor.
Claim 2
Dependent Claim
89 words
The apparatus as described in claim 2 wherein a double roller is located just ahead of the point at which the spray of hot liquid leveling agent is caused to impinge on the surface of the electrical circuit board which is passing between the rollers the said spray, after impingement on the board, is deflected by the board toward the lower roller and is caused to impinge on the surface of the roller which causes the hot liquid to be deflected back toward the center of the leveling tank.
Claim 3
Dependent Claim
96 words
The apparatus as described in claim 3 wherein the actual leveling operation by impingement of a hot liquid against the surface of the electrical circuit board which has been coated with a hot tin lead solder, which impingement is for the purpose of melting and removing the excess solder from the surface of the board, is confined to the space that exists between two of the sets of double rollers, thereby limiting the time in which the board is exposed to the temperature of the hot liquid leveling agent to a period of approximately 3 seconds.
Claim 4
Dependent Claim
111 words
The apparatus as described in claim 4 wherein the application of a hot tin lead solder to the exposed copper surfaces of an electrical circuit board is accomplished at a point which lies approximately 4 inches in front of the point at which the excess solder is removed from that board by the impingement of a hot liquid spray, which location allows the automatic recovery and reuse of the excess solder by redirection of the leveling agent and the excess solder into the open top of the wave soldering tank wherein the liquid leveling agent float on top of the solder in the tank and drains back into the leveling tank.
References Cited (Backward Citations)
US850548A
Cited
US3218193A
Cited
US3207128A
Cited
US3190527A
Cited
US3605244A
Cited
US3500536A
Cited
US3491779A
Cited
US3482755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |