NEW HAVEN, Conn. — It looks like the summer litigation season is underway.

A Pennsylvania beach chair manufacturer is suing a rival Connecticut company for alleged patent infringement.

Lawyers for Rio Brands, of West Conshohocken, Pennsylvania, say GCI Outdoor, of Haddam, Connecticut, is selling so-called “backpack chairs” similar to Rio Brands’ chairs. Straps allow the chairs to be carried like backpacks.

Rio Brands officials say they discovered GCI Outdoor was selling similar chairs on May 10 at the National Hardware Show in Las Vegas. The Connecticut Law Tribune reports (http://bit.ly/2rYQBff ) the lawsuit was filed two days later.

GCI Outdoor owner Daniel Grace declined to comment.

Rio Brands seeks undisclosed damages and an order barring GCI Outdoor from selling the similar chairs.

Rio Brands says it’s been selling its patented backpack chairs for 13 years.