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Keith W. Sheffield — 3 Patents

CRCrews: 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

Showing 1–3 of 3 patents

Patent #	Title	Co-Inventors	Date
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