The following PDF below shows patents that are based on our original designs. Cool Sound Industries MAIN PATENT which Herbert F. Wighard is given credit to for all patents below. Which are related to the "Double Acting Pulse Tube Electroacoustic System" the original patent number is US 5813234 and is used for thermoacoustic air conditioning.

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** In July 2025 the company has 24 new advanced design patents to the original patents for cooling & heating that are ready at this time.