2.
    发明专利
    未知

    公开(公告)号:DE2350275A1

    公开(公告)日:1974-05-30

    申请号:DE2350275

    申请日:1973-10-06

    Applicant: IBM

    Abstract: 1397481 Photo-mask INTERNATIONAL BUSINESS MACHINES CORP 19 Sept 1973 [17 Nov 1972] 43957/73 Heading G2X An exposure mask is formed by (1) selectively exposing a light-sensitive layer (e.g. a diazo layer) on a substrate to form an image which is visible in non-actinic light, (2) visually locating defects (e.g. spots or holes) in the image with non-actinic light, (3) correcting the defects by the local application of light-sensitive material to, and/or the local exposure of light-sensitive material on, the substrate, and (4) developing to form a permanent image.

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