JC

John E. Cromwell

📍 Baltimore, MD: #1,687 of 4,923 inventorsTop 35%
🗺 Maryland: #13,387 of 35,612 inventorsTop 40%
Overall (All Time): #2,366,859 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4334927 Piston ring coatings Glenn F. Hyde 1982-06-15
4307890 Piston ring with chrome-filled groove Nicholas Herbert, Glenn F. Hyde 1981-12-29