An AI imaging firm says Johnson & Johnson stole its tech. Testimony began Monday.

ChemImage, a small biotech company based in Pittsburgh, is taking the global healthcare company Johnson & Johnson to federal court in Manhattan.

Daniel Hulshizer/AP

• Johnson & Johnson executives are scheduled to take the stand in a trial that started Monday.
• ChemImage, a small biotech firm, sued the healthcare giant over a 2019 partnership that went south.
• Johnson & Johnson had signed a multibillion-dollar contract with the Pittsburgh-based company.

In 2019...