Photolithographic mask fabrication

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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06830851

ABSTRACT:

TECHNICAL FIELD
This invention relates to fabrication of photolithographic masks for semiconductor processing.
BACKGROUND
Photolithography uses an imaging system that directs radiation onto a patterned mask to form an image that then is projected onto a semiconductor wafer covered with light-sensitive photoresist.


REFERENCES:
patent: 5328784 (1994-07-01), Fukuda
patent: 5503950 (1996-04-01), Miyake et al.
Masaaki Ito et al., Optical Technology for EUV Lithography pp. 9-12, 1996, Central Research Laboratory, Hitachi, Ltd., Tokyo 185, Japan.

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