What invention resulted in Elias Howe suing Isaac singer for patent infringement?

Elias Howe sued Isaac Singer for patent infringement over the invention of the sewing machine. Howe had patented a sewing machine design in 1846 that featured a lockstitch mechanism and an eye-pointed needle, while Singer's machine used a similar concept. Howe claimed that Singer's machine infringed on his patent, leading to a significant legal dispute in the 1850s. Ultimately, the case underscored the complexities of patent law in the rapidly evolving industrial era.