One way to receive free crochet patterns from a yarn company is to buy yarn, as many companies include patterns inside of the labels on their yarn. Another way to receive free crochet patterns is to visit a yarn company's website.
Berroco.com has over 100 free crochet patterns, Redheart.com and Yarnspirations.com each have over 1,000 crochet patterns, and Lionbrand.com has over 2,000 free crochet patterns to choose from.
Many yarn companies also have a newsletter readers can subscribe to. These newsletters typically include free patterns, coupons and special promotions. They may be sent weekly, monthly or quarterly, depending on the company.