DH

Douglass E. Hughes

UN Unknown: 1 patents #267 of 2,778Top 10%
📍 Boulder, CO: #54 of 443 inventorsTop 15%
🗺 Colorado: #292 of 2,977 inventorsTop 10%
Overall (2002): #67,590 of 266,432Top 30%
2
Patents 2002

Issued Patents 2002

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
6468435 Automatic valved filter assembly Raymond G. Bryan 2002-10-22
6395170 Universal filter for soda pop and bottled water bottles Raymond G. Bryan 2002-05-28