Pfizer Inc., New York, made voluntary contributions of $450 million to its U.S. pension plans in July, according to a 10-Q filing today. It also contributed $294 million to its international pension plans for the first six months of 2006. For 2006, company officials plan to contribute a total of $453 million to the U.S. plans and $449 million to the international plans. Pfizer had $6.9 billion in U.S. defined benefit assets as if Sept. 30, according to data provided to Pensions & Investments. Sharon Kinsman, assistant treasurer, did not return calls by press time seeking further information.