He handed the business over to his son William Salt in 1755 who had been learning the family trade as a journeyman with Mr. La Roche in Silver Street London.

After William's death in 1793 the business was passed onto Richard Salt who in the 1800s relocated the factory to larger premises in Dale End, Birmingham.

By the end of the 19th century, trade in Birmingham was improving and so was the Salts' business, achieving the Royal Seal of Approval and becoming in 1845 Cutlers to Her Majesty.

The business now being led by Thomas Partridge II along with Ashton T. Salt was manufacturing a wide range of appliances and attending to various conditions, from amputations to back complaints.

Three years later Professor Brian Brooke from Birmingham General Hospital approached Salts to see if it could make collection devices similar to the ones he had seen produced in the US.