Patent Analysis, Technological Gaps and Development Prospects of Combined Ultrasonic and Laser Exhaust Gas Cleaning

A literature and patents on gas purification using ultrasound and laser radiation is presented. It confirms that ultrasound is effective for fine particle coagulation, while laser radiation works well for oxidizing and dissociating harmful compounds. Although many patents exist for each method separately, none combine them in a single system, particularly in muffler design. Patent analysis shows technological stagnation, with 53.3% of patents over 20 years old and few recent developments. The findings support the feasibility of a combined approach using ultrasound and laser either synergistically or sequentially which could lead to innovative mufflers enabling multi-stage purification without catalytic converters or full exhaust system replacement