Microsoft on Friday announced that it has officially acquired N-trig, the company that it has worked with to build the Surface Pen for its Surface tablets.

According to its website, N-trig owns more than 100 patents related to digital pens and related tech that helps enables customers to use natural handwriting for input on touch screens. Its technology has been used in dozens of consumer products from Dell, Lenovo, HP, Fujitsu, Sharp, Toshiba and other major OEMs. 

"We can't wait to show you what we'll deliver for our Surface Fans in the future," Microsoft said of the acquisition. "Digital pens have a ways to go to be as good as pen and paper on some dimensions, and we'll get there. But more importantly, adding the ability to capture and share the work you do with a digital pen opens up possibilities that traditional pen and paper just can't match. Today's investment is another step that will let us push that innovation forward."

Terms of the deal were not disclosed, though a report from Reuters in February, which first discussed the acquisition, said N-trig was valued at about $75 million.