Celebrating Labor Day in Patents Posted on August 30, 2019 by bwheelock A number of patents mention Labor Day, most of these relate to calendars or calendar-based games. U.S. Patent No. D34888 on a Design for Medalcelebrates the laborer U.S. Patent No. 2,284,256 covers on a Card Game features a Labor Day Card U.S. Patent No. 3,565,437 on a Discount Store Board Game Apparatus, features a Labor Day sale card (68).