Defective products usually involve strict liability or negligence. This means the defendant was not acting with a purposeful intention to harm another person.Design flaws encompass issues or deficiencies within a product's design that render it unsafe or ineffective for its intended purpose. Any failure of a product to conform to any relevant representation or warranty. The Henry Law Firm is Cleveland's trusted advocate for product liability claims. What are Ohio's product liability laws? What Does it Mean to Bring a Product Liability Claim? What are the types of product liability claims? A manufacturing defect occurs when something goes wrong in the manufacturing process for a particular product. With product liability claims, you don't need to prove negligence on the defendant's part.