ResMed – which makes masks, devices and accessories to treat sleep apnea and other respiratory conditions – has filed a patent infringement petition against a New Zealand-based competitor. File photo by Jamie Scott Lytle

ResMed – which makes masks, devices and accessories to treat sleep apnea and other respiratory conditions – has filed a patent infringement petition against a New Zealand-based competitor. File photo by Jamie Scott Lytle

— A patent dispute between ResMed and Fisher & Paykel Healthcare has escalated...

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