Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8985767 | Wavefront optimized progressive lens | Ray Steven Spratt, Timo Kratzer | 2015-03-24 |
| 8297751 | Multi-focal lenses with segmented boundaries | Ray Steven Spratt, Wolf Krause | 2012-10-30 |
| 8205987 | Method for optimizing a spectacle lens for the wavefront aberrations of an eye and lens | Timo Kratzer, Jesús Miguel Cabeza Guillén, Ray Steven Spratt, Markus Welscher, Gerhard Kelch +1 more | 2012-06-26 |