An online trade-in system comprises: a pricing guide module, an affiliates module, a marketplace listing module, a trade-in website module, a transaction processing module, an inventory handling module, a database and a marketplace manager. The marketplace manager creates an online trade-in system that...http://www.google.de/patents/US20060089897?utm_source=gb-gplus-sharePatent US20060089897 - Systems and methods for online trade-in of goods
