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David M. Chenal

JHJmj Holdings: 2 patents #1 of 1Top 100%

Frederic, WI: #1 of 1 inventorsTop 100%

Wisconsin: #728 of 4,723 inventorsTop 20%

Overall (2021): #169,959 of 548,734Top 35%

2 Patents 2021

Issued Patents 2021

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
11179273	Sound-attenuation system	—	2021-11-23
10940043	Sound attenuation apparatus and method	—	2021-03-09