4DS Memory Limited is a semiconductor development company located in Silicon Valley that specializes in non-volatile memory technology. The company has developed Interface Switching ReRAM, a type of non-filamentary ReRAM, for next-generation gigabyte storage class memory. 4DS was established in 2007 and owns a portfolio of patented intellectual property, including 18 US patents that are already granted and 5 patents that are still pending. The company has developed this technology in-house to create high-density storage class memory.