Richard A. Christensen

📍 Minneapolis, MN: #2,566 of 6,114 inventorsTop 45%

🗺 Minnesota: #23,881 of 52,454 inventorsTop 50%

Overall (All Time): #2,253,819 of 4,157,543Top 55%

Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
5968591	Methods and compositions for preventing corrosion within salt-water cooled internal combustion engines	—	1999-10-19
4794711	Perpetual engagement calender and wallet	—	1989-01-03