RH

Roberta C. Harper

3M: 3 patents #4,214 of 11,543Top 40%
Overall (All Time): #1,622,681 of 4,157,543Top 40%
3
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
6234171 Molded respirator containing sorbent particles James E. Springett, Leonard W. Barrett 2001-05-22
6133173 Nonwoven cohesive wrap John E. Riedel, Eugene G. Joseph 2000-10-17
6102039 Molded respirator containing sorbent particles James E. Springett, Leonard W. Barrett 2000-08-15