DH

Donald L. Heffner

General Motors: 1 patents #107 of 586Top 20%
📍 Miamisburg, OH: #3 of 8 inventorsTop 40%
🗺 Ohio: #715 of 3,574 inventorsTop 25%
Overall (1989): #119,569 of 140,708Top 85%
1
Patents 1989

Issued Patents 1989

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4856554 Vacuum check valve and method of control Dennis G. Merical, David A. Homan 1989-08-15