US3776771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for etch resist coating of plated holes in printed circuit boards
Assignee: Individual
•
Filing: 1972-02-09
•
Granted: 1973-12-04
•
Expires: 1992-02-09
Abstract
Abstract Etch resist coating is applied into the plated holes in a printed circuit board by dipping the board in a liquid etch resist solution of fairly low viscosity, squeezing the etch resist into the holes by pressing the board between opposed press rolls, followed by first squeegeeing the top and then the bottom of the board to wipe both surfaces. This results in a resistcoated hole.
Inventors
- 👤 D Shepard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:23
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/0094; H05K2201/00; H05K2201/09; H05K2201/09209; H05K2201/095; H05K2201/09581; H05K2203/00; H05K2203/01; H05K2203/0104; H05K2203/0143; H05K2203/02; H05K2203/0278; H05K2203/15; H05K2203/1509; H05K3/02; H05K3/06; H05K3/061; H05K3/40; H05K3/42; H05K3/425; H05K3/427
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
46 words
The process of claim 1 wherein the coating step is accomplished by applying a liquid coating solution having a viscosity between 10 and 20 Sayboldt seconds to the printed circuit board so that the liquid coating solution readily flows through holes in the printed circuit board.
Claim 2
Dependent Claim
28 words
The method of claim 2 wherein the step of applying the liquid coating solution comprises dipping the printed circuit board into a vessel containing the liquid coating solution.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein said squeegeeing steps are succeeded by the step Of drying the coating solution on the printed circuit board.
Claim 4
Dependent Claim
13 words
The method of claim 4 wherein said drying step is a baking step.
Claim 5
Dependent Claim
26 words
The method of claim 4 wherein the step of applying the coating solution comprises dipping the printed circuit board into a vessel containing the coating solution.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |