Optical resin wafers; optical plastic wafers; high precision optical flats; optical wafers; highly flat substrate (terms too vague in the opinion of the International Bureau ? Rule 13 (2) (b) of the Regulations); flat substrate (terms too vague in the opinion of the International Bureau ? Rule 13 (2) (b) of the Regulations); precision flat substrate (terms too vague in the opinion of the International Bureau ? Rule 13 (2) (b) of the Regulations); ultra flat substrate (terms too vague in the o...