Erhard Effer

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Pocking, DE

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Patents Grantslast 30 patents

Information Patent Grant
Process for the production of a photochromic object
- Patent number 6,171,525
- Issue date Jan 9, 2001
- Optische Werke G. Rodenstock
- Erhard Effer
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Optically transparent photochromic plastic material
- Patent number 5,498,686
- Issue date Mar 12, 1996
- Optische Werke G. Rodenstock
- Erhard Effer
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Anti-reflection film for an optical element consisting of an organi...
- Patent number 4,852,974
- Issue date Aug 1, 1989
- Optische Werke G. Rodenstock
- Manfred Melzig
- G02 - OPTICS