The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 2002
Filed:
Nov. 08, 2000
Tokyo Ohka Kogyo Co., Ltd., Kanagawa-ken, JP;
Abstract
Disclosed is a negative-working photolithographic patterning material consisting of a substrate and a negative-working photoresist layer having a relatively large thickness on the substrate surface which is suitable for the formation of a patternwise masking layer in a patternwise ion-implantation or metal plating treatment. The negative working photoresist layer is formed from a negative-working chemical amplification photoresist composition comprising an alkali-soluble resinous ingredient, a radiation-sensitive acid-generating agent and a crosslinking agent, of which the alkali-soluble resinous ingredient is a m-cresol novolak resin prepared by the acid-catalyzed condensation reaction of formaldehyde and m-cresol alone as the phenolic reactant or a combination of such a m-cresol novolak resin and a polyhydroxystyrene resin of which at least 50% by weight is the m-cresol novolak resin.