Microsoft and Google have agreed to bury all patent infringement litigation against each other and settled 18 cases in the United States and Germany.

The pair said the deal puts an end to court fights involving a variety of technologies, including mobile phones, wifi, and patents used in Microsoft's Xbox game consoles and other Windows products.

The agreement also drops all litigation involving Motorola Mobility, which Google sold to Lenovo last year while keeping its patents.

Microsoft and Google continue to make products that compete directly with each other, including search engines and mobile computing devices, the agreement notably does not preclude any future infringement lawsuits.

"Google and Microsoft have agreed to collaborate on certain patent matters and anticipate working together in other areas in the future to benefit our customers," the companies said in a joint statement. They did not disclose the financial terms of the deal.

The companies said they have been cooperating on such issues as the development of a unified patent court for the European Union, and on royalty-free technology for speeding up video on the Internet.

The bitterest battle took place in 2010 when Redmond accused Motorola, of breaching its obligation to offer licenses to its wireless and video patents used in Xbox systems at a reasonable cost.

In July, a US appeals court ruled that the low licensing rate Microsoft pays to use the patents had been properly set by a federal judge in Seattle.

Wednesday's agreement is not the first among smartphone heavyweights to settle their patent disputes. In 2014, Samsung and Apple agreed to drop all litigation against one another outside the United States.