"The case involves U.S. Patent No. 8,585,979, which covers photo-catalytic air purification cells that use UV light striking catalyst-coated targets to produce ions that eliminate airborne contaminants."
"The district court granted summary judgment of noninfringement, finding that the applicant had disclaimed polished aluminum during prosecution and that the disclaimer logically extended to unpolished aluminum as well."
The Federal Circuit affirmed a decision that an applicant's statement during patent prosecution can limit the patent's scope permanently. In Puradigm, LLC v. DBG Group Investments LLC, the applicant's claim involved photo-catalytic air purification cells with specular UV reflectors. The district court ruled that the applicant had disclaimed polished aluminum reflectors during prosecution, which extended to unpolished aluminum as well. This case emphasizes the importance of careful language in patent applications, as statements can have lasting implications on patent rights.
Read at Patently-O
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