Columbia Sportswear North America Inc. is accusing winter gear maker Seirus Innovative Accessories Inc. and fabric company Ventex Co. Ltd. of conspiring to bring fraudulent patent challenges against its glove-lining patents.

Columbia sued Seirus and Ventex Jan. 29 in U.S. District Court for the District of Oregon for conspiring to commit fraud, abusing court process, and violating federal and Oregon state racketeering laws.

Seirus paid Ventex to attack two Columbia design patents at the Patent Trial and Appeal Board by...