When a defective product causes harm, victims may be entitled to compensation under Pennsylvania's product liability laws. There are three categories of defective product claims in Pennsylvania: 1) manufacturing defect; 2) design defect; and 3) failure to warn.The individual needs to show that the defect specifically caused the harm. Call our Montgomery County product liability attorneys at 215-822-7575 today! At McEldrew Purtell, we have over 30 years of experience in litigating product liability cases. We take all claims on a contingency basis. Product Liability Lawyers Located in Philadelphia. We are lawyers who represent people in Pittsburgh and throughout Pennsylvania who have been injured as a result of dangerous and defective products. The consumer expectation test offers logical guidance to courts and juries in judging defect. The state of Pennsylvania limits filing of product liability claims to two years from the date of the injury.