Sun Microsystems has acquired Chelmsford, Mass.’ SavaJe, an open standards Java mobile phone operating system, for an undisclosed amount.

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The amount was undisclosed.

The company raised more than $80 million across several rounds of financing since 1999, when it started as a spin-out from Lucent and got backing from that company, and later getting several rounds of backing from Vodafone Ventures, Ridgewood Capital Management and RRE Ventures.

Other backers over the years were T-Mobile, France Telecom’s Orange, New Venture Partners and VantagePoint Venture Partners.