About Us Hayes Philadelphia/Wilmington serves Philadelphia, Delaware and Chester counties in Pennsylvania as well as New Castle and Kent counties in the State of Delaware. Owned and operated by Patrick Brosnan, Hayes Philadelphia/Wilmington has been serving the needs of dental professionals since 2003. We’ve been a long time sponsor of The Dental Society of Chester and Delaware Counties and their Dentists Keeping Up! (DKU) program. We also sponsor the Delaware State Dental Society Continuing Education Series. We want to thank all our existing customers for their past support and encourage new customers to contact us and discover the benefits of a local repair service that actually understands your issues and can guide your staff in maintaining your handpieces. Just as your name is on your practice, my name is on the repair. Contact Patrick Brosnan at 800-724-0578 or 610-565-2502.