KS

Keith W. Sheffield

CR Crews: 2 patents #2 of 6Top 35%
Overall (All Time): #1,642,696 of 4,157,543Top 40%
3
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
5608470 Prescription lens attachable to safety glasses — 1997-03-04
D372490 Safety glasses and prescription lens insert combination John Chin 1996-08-06
5428407 Prescription lens attachable to safety glasses — 1995-06-27