Summa Industries is suing two companies for alleged patent infringements on a Summa subsidiary's injection molded prismatic reflector lighting products.
Summa filed suit March 21 against major customer Cooper Industries Ltd. of Houston and March 13 against a Bai Hua, China-based lighting products manufacturer and its affiliate Grandlite International Corp. of City of Industry, Calif.
The suits, filed in U.S. District Court in Grand Rapids, Mich., allege infringement of a patent of Summa subsidiary LexaLite International Corp.
Torrance-based Summa gave notice in February of its intentions to protect its intellectual property.
``Courteous letters have gone out to several competitors,'' James Swartwout, Summa chairman and chief executive officer, said by telephone.
LexaLite's Reflexor-brand products are sold worldwide. Summa estimated the market for the niche prismatic reflector products at less than $30 million per year.
Summa sales to the Cooper electrical products segment were about $4.5 million, or about 4 percent of Summa's total, in the year ended Aug. 31.
Summa acquired Charlevoix, Mich.-based LexaLite in November 1996. Reflexor-brand products are primarily injection molded.
Nasdaq-traded Summa reported profit of $687,000 on sales of $27.6 million for the quarter ended Feb. 28.