DF

Douglas Robert David Frost

UN Unknown: 2 patents #12,644 of 83,584Top 20%
Overall (All Time): #2,178,720 of 4,157,543Top 55%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
6874172 Dual discharge valve 2005-04-05
5926861 Discharge valve 1999-07-27