Patents Assigned to Firma Korsten & Goossens
  • Patent number: 5358622
    Abstract: A procedure for producing printed circuit boards with pads for insertion of SMDs. A copper lined base plate is provided with a positive photoprotective layer with a coating thickness lesser or equal to the depth of the pads to be built up for the connection of SMD components. The positive photoprotective layer is exposed using a primary film with a window mask corresponding to the desired pad arrangement, and the exposed base plate is developed in a developing bath such that the photoprotective layer is removed in the area of the exposed windows, exposing open copper areas there. The base plate developed in this way is exposed with a secondary film with a mask for the strip conductors, whereby the strip conductors are modeled as opaque areas.
    Type: Grant
    Filed: June 16, 1993
    Date of Patent: October 25, 1994
    Assignee: Firma Korsten & Goossens
    Inventor: Gunter Korsten