Inventor
KELLER LEO
CH6 patents
⚠️ This page may combine multiple inventors who share the name “KELLER LEO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
OPTREL AG
5 patentsUS6675800B2Jan 13, 2004
Emergency flight safety device
OPTREL AG58 citations93
US6270223B1Aug 7, 2001
Active electro-optical filter device and glare-protection device
OPTREL AG39 citations87
US9610198B2Apr 4, 2017
Protection device for a welder
OPTREL AG7 citations80
US10736782B2Aug 11, 2020
Face protector
OPTREL AG5 citations71
US10098788B2Oct 16, 2018
Electro-optical glare-protection filter with a liquid crystal cell being a fringe-field switching cell for a welder protection device
OPTREL AG0 citations46