AdvanSource Biomaterials Corp. filed a patent application with the U.S. Patent and Trademark Office for its ChronoSil silicone-urethane copolymer.

The Wilmington, Mass.-based company, which develops polymers for medical devices, said the patent relates to methods for making the product, which it touts as combining some of the physical properties of polyurethanes with the feel and characteristics of silicones.

AdvanSource spun outof CardioTech International last year, after CardioTech sold off the Catheter and Disposables Technology OEM business it acquired in 2001 and turned its focus solely to developing medical device biomaterials.