Valid through to 07/23/19 on www.spreadshirt.com, but not in Spreadshirt's Partner Shops. A combination of a volume discount (from 6 products) and other promo codes is not possible. Minimum order value: $30. The discount only applies to the 5 cheapest products of the order. Not valid towards the purchase of gift certificates.
We love Patent Prints. The old and rare drawings and illustrations that are part of patent blueprints make for fantastic artwork on any product. Our goal is to display and promote vintage patents as a way of preserving history.