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This invention describes a way to make a filter with many tiny, uniformly sized holes. It involves pouring a liquid plastic onto a special mold that has many tiny pillars, then hardening the plastic. Once the plastic is solid, the mold is dissolved away, leaving behind a filter with precise holes, which can then be attached to supports.
Why it matters: Since 2009, microfabrication techniques like photolithography have become more precise and accessible, potentially lowering the cost and complexity of creating the necessary molds. Advances in curable resin materials could also improve filter performance or manufacturing efficiency.
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