Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1991-11-19
1993-09-21
Beck, Shrive
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
427271, 427272, 427282, 427421, 427458, 118505, C23C 2600
Patent
active
052467309
ABSTRACT:
A method of applying a conformal coating to a printed circuit board and components attached thereto while leaving selected components attached thereto uncoated, comprises the steps of providing a printed circuit board having a multiplicity of components attached thereto, including selected components that are not to be coated; enclosing the selected components within conductive protective enclosures sized to enclose the selected components therein and thereby protect those components from the intrusion of conformal coating material, the enclosures having sufficient electrical conductivity to discharge electrostatic charges therefrom when one of the enclosures is contacted by an electrically conductive medium, thereby protecting the components attached to the printed circuit board from damage due to the discharge of electrostatic charges from the enclosures; applying a conformal coating to the printed circuit board, thereby conformal coating the enclosures and the components which are not protected by the enclosures; and removing the coated enclosures from the selected components.
REFERENCES:
patent: 3973321 (1976-08-01), Horton
patent: 4300184 (1981-11-01), Colla
patent: 4353970 (1982-10-01), Dryczynski
patent: 4678531 (1987-07-01), Metzger
patent: 4784310 (1988-11-01), Metzger
patent: 4820196 (1989-04-01), Roselle
patent: 4830922 (1989-05-01), Sparrowhawk
patent: 4959752 (1990-09-01), Samarov
patent: 5102712 (1992-04-01), Peirce
Becker Raymond P.
Peirce Roger J.
Beck Shrive
Conductive Containers Inc.
Dang Vi Duong
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