What was the patent number for the transatlantic telegraph cable?

The patent number for the transatlantic telegraph cable was U.S. Patent No. 4,237, granted to Sir William Thomson (Lord Kelvin) in 1856. This patent covered the design and materials used for the cable, which was crucial for the successful communication between North America and Europe. The transatlantic telegraph cable was first successfully laid in 1858, significantly impacting global communication.