John E. Cromwell

📍 Baltimore, MD: #21 of 93 inventorsTop 25%

🗺 Maryland: #154 of 841 inventorsTop 20%

Overall (1982): #53,538 of 81,411Top 70%

Patents 1982

Issued Patents 1982

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
4334927	Piston ring coatings	Glenn F. Hyde	1982-06-15