Updated, 4:45, with comment from Datallegro CEO Stuart Frost
The suit, filed in federal court in San Diego by Cary Jardin, charges that Datallegro and CEO and founder Stuart Frost, infringed on a patent held by Jardin. The suit alleges that Frost gained access to Jardin's technology while he was CEO of Xprime, where Jardin worked, in 2003.
The lawsuit also alleges that Frost attempted to patent Jardin's technology and also used the technology, for which Jardin has a patent, while at Datallegro.
"Shortly after leaving Xprime, defendant Frost attempted to convert Jardin's inventions to his own by filing with the USPTO patent applications in the distributed database architecture field, the same subject matter as Jardin's intellectual property," according to the complaint. "At Datallegro, defendant Frost used and incorporated Jardin's intellectual property into Datallegro's products."
The suit seeks damages, which it asks to be tripled for willful infringement, as well as temporary and permanent injunctions against Datallegro and Frost.
Microsoft announced last month that it was acquiring Datallegro, which is based in Orange County, Calif.
Update: As he noted in the comments section, Frost has posted a blog in response to the suit.
"After analyzing the claims, we feel strongly that they're completely without merit and intend to vigorously defend our position," Frost said. "Given the prior art in this area, we're also considering asking the Patent Office to re-examine Jardin's patent."
Microsoft has declined to comment.