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Before joining Unitalen Attorneys At Law, Mr. CAI was a patent attorney in a Patent & Trademark Law Office for eight and a half years. Mr. CAI has extensive experiences in handling patent affairs in the fields of mining, metallurgy, metallic and non-metallic materials, functional materials and devices, inorganic chemistry, chemical engineering, electro-chemical engineering and semiconductor devices etc. Mr. CAI provides various patent services, including preparation and prosecution of patent applications, legal opinions on patent validity, patent infringement analysis, patent litigation.