The technology titans behind the top two smartphone platforms in the world have called a truce in a long-running patent war.

“Apple and Google have agreed to dismiss all the current lawsuits that exist directly between the two companies,” the companies said in a joint statement.

“Apple and Google have also agreed to work together in some areas of patent reform.”

The companies made it clear that the detente does not include licensing their technology to each other.

Motorola filed a patent lawsuit against Apple in US federal court four years ago, prompting the iPhone maker to fire back with a patent suit of its own.

Litigation has spread to more than a dozen other courts.

Google took on the legal wrangling when it bought Motorola Mobility in 2012 in what was seen at the time as a move to use its patents for defending Android operating software in the increasingly litigious smartphone and tablet markets.

Early this year, Google agreed to sell Motorola Mobility to China-based computer giant Lenovo. The sale has yet to be completed.

California-based Apple has been battling smartphone competitors in courts around the world, accusing rivals using Google’s Android software of copying features from its popular mobile devices.

The legal truce between Apple and Google does not take the pressure off South Korea-based Samsung, which has been a prime legal target for the maker of iPhones and iPads.

A Japanese court ruled earlier that Samsung could seek minimal damages from Apple for patent infringement, with both sides claiming victory in the their latest legal skirmish over the design of their smartphones.

Japan’s Intellectual Property High Court ruled that Samsung could claim Y9.96 million ($A105,124) from its US arch-rival for use of Samsung’s data transmission technology, found to have been used in Apple’s iPhone 4 and iPad 2.