Bloomberg News

DuPont Sues Heraeus Over Patent for Solar-Cell Technology

September 02, 2011

(Updates with excerpt from complaint in third paragraph.)

Sept. 2 (Bloomberg) -- DuPont Co., the largest U.S. chemical company by market value, sued Germany’s Heraeus Holding GmbH, alleging infringement of a U.S. patent for material used in building solar cells.

Heraeus, of Hanau, Germany, owes DuPont damages for using the technology, which includes a conductive paste of silver, glass and resin, lawyers said in a complaint filed in federal court in Wilmington, Delaware, today.

The infringement “will continue to cause DuPont irreparable injury and damage” unless stopped by the court, according to court papers. The Wilmington-based company also seeks a jury trial.

“DuPont invests significant resources and millions of dollars in research,” said David B. Miller, president of DuPont Electronics & Communications, in a statement. “We will continue to take appropriate actions to protect our patent estate.”

“We do not have any information on this case at the moment. No lawsuit has been officially served,” Martina Rauch, a Heraeus spokeswoman, said in an e-mailed statement.

DuPont fell 76 cents, or 1.6 percent, to $47.06 at 11:40 a.m. in New York Stock Exchange composite trading. The stock has fallen 5.7 percent this year.

The case is DuPont v. Heraeus Holding, 11CV773, U.S. District Court, District of Delaware (Wilmington).

To see the patent, click: 7,767,254.

--With assistance from Dawn McCarty and Steven Church in Wilmington, Delaware. Editors: Glenn Holdcraft, Charles Carter

To contact the reporter on this story: Phil Milford in Wilmington, Delaware, at

To contact the editor responsible for this story: Michael Hytha at

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