SINGAPORE - Singapore tech company Creative has filed a notice of appeal in the United States over a patent-related case.

The company had previously alleged that Samsung, LG, Sony, HTC, Lenovo/Motorola, ZTE and Blackberry infringed its Zen patent, which covers the interface that allows users of portable media players to navigate among and select tracks.

The claims were judged to be directed to ineligible subject matter. Creative then filed a petition for the US International Trade Commission (ITC) to review the decision. The ITC determined that it would not review the decision, and terminated the investigation.

Creative filed its latest appeal on Sept 23, the company said in a statement on Saturday (Sept 24).

The appeal process is expected to take 12 to 15 months.

The appeal and termination of the investigation are not expected to have any material impact on the net tangible assets and earnings per share of Creative for the current financial year, the company's statement added.