Leo Keller

Follow

Person

Rueti, CH

People

Patents Grantslast 30 patents

Information Patent Grant
Face protector
- Patent number 10,736,782
- Issue date Aug 11, 2020
- Optrel Holding AG
- Ramon Hofer Kraner
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Electro-optical glare-protection filter with a liquid crystal cell...
- Patent number 10,098,788
- Issue date Oct 16, 2018
- Optrel Holding AG
- Leo Keller
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Protection device for a welder
- Patent number 9,610,198
- Issue date Apr 4, 2017
- OPTREL AG
- Ramon Hofer-Kraner
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Emergency flight safety device
- Patent number 6,675,800
- Issue date Jan 13, 2004
- OPTREL AG
- Leo Keller
- A62 - LIFE-SAVING FIRE-FIGHTING
Information Patent Grant
Active electro-optical filter device and glare-protection device
- Patent number 6,270,223
- Issue date Aug 7, 2001
- Optrel AG
- Franco Del Bon
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE

Patents Applicationslast 30 patents

Information Patent Application
ELECTRO-OPTICAL GLARE-PROTECTION FILTER
- Publication number 20170360612
- Publication date Dec 21, 2017
- OPTREL AG
- Leo KELLER
- G02 - OPTICS
Information Patent Application
PROTECTION DEVICE FOR A WELDER
- Publication number 20160081856
- Publication date Mar 24, 2016
- OPTREL AG
- Ramon HOFER-KRANER
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Application
FACE PROTECTOR
- Publication number 20150033431
- Publication date Feb 5, 2015
- OPTREL AG
- Ramon Hofer Kraner
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Application
FACE PROTECTOR FOR WELDER
- Publication number 20150033430
- Publication date Feb 5, 2015
- OPTREL AG
- Ramon Hofer Kraner
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Application
DEVICE AND METHOD FOR DAZZLE PROTECTION
- Publication number 20140320771
- Publication date Oct 30, 2014
- OPTREL AG
- Leo Keller
- G02 - OPTICS
Information Patent Application
Emergency flight safety device
- Publication number 20010010225
- Publication date Aug 2, 2001
- Leo Keller
- G02 - OPTICS