This ASNB patent, proven effective by the lack of infections in the powerwand studies (over 30,000 days of use) has value, imo. But they have no value assigned to it as an asset on the books.
Antimicrobial polyurethane resins and products made therefrom Patent number: 7772296 Abstract: The present invention provides novel antimicrobial polyurethane compositions having excellent mechanical and biocompatibility properties, and methods to prepare them. The antimicrobial polyurethane compositions include a homogenous distribution of silver ions by incorporating this antimicrobial agent into the composition prior to the complete polymerization of the polyurethane. In preferred embodiments, the silver ion is associated with a carrier, such as zirconium phosphate or soluble glass powder. The present invention also includes components made from the antimicrobial polyurethane compositions, such as medical devices. (my emphasis)
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