Optical proximity correction photomasks

Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Radiation mask

Reexamination Certificate

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Reexamination Certificate

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07579121

ABSTRACT:
An optical proximity correction photomask comprises a transparent substrate, a main feature having a first transmitivity disposed on the transparent substrate and at least one assist feature having a second transmitivity disposed to each side of the main feature and on the transparent substrate, wherein the first transmitivity is not equal to the second transmitivity.

REFERENCES:
patent: 5786113 (1998-07-01), Hashimoto et al.
patent: 5821014 (1998-10-01), Chen et al.

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