Apple’s $1 billion victory over Samsung in a patent-infringement case was cut about 45 percent by a judge who ordered a new trial on damages for some Samsung products.

US District Judge Lucy Koh’s ruling on Friday reduced the jury’s damages award by $450.5 million. Koh said the companies should consider appealing her ruling before any trial begins.

“This is an extremely careful and thorough opinion on a very difficult and interrelated set of issues,” Stanford Law School professor Mark A. Lemley said.