Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6231182 | Monofocal ophthalmic lens having two aspherical surfaces | Herbert Pfeiffer, Walter Haimerl, Helmut Altheimer, Gregor Esser | 2001-05-15 |
| 5920372 | Ophthalmic lens having an astigmatic effect | Herbert Pfeiffer, Helmut Altheimer, Rudolf Barth | 1999-07-06 |
| 5880810 | Series for progressive spectacle lenses | Helmut Altheimer, Rudolf Barth, Peter Baumbach, Jochen Brosig, Gregor Esser +3 more | 1999-03-09 |
| 5148205 | Ophthalmic lens having a changing refractive index | Helmut Altheimer, Herbert Pfeiffer | 1992-09-15 |
| 5061058 | Opthalmic lens for use in the correction of astigmatism | Herbert Pfeiffer, Helmut Altheimer | 1991-10-29 |
| 5042936 | Progressive ophthalmic lens | Herbert Pfeiffer, Helmut Altheimer | 1991-08-27 |
| 4955712 | Multifocal lens | Rudolf Barth, Dieter Kalder | 1990-09-11 |
| 4946270 | Progressive power ophthalmic lens | Rudolf Barth, Hans Stetter | 1990-08-07 |
| 4856889 | Uniform strength ophthalmic lens having a gradient refractive index changing rotation-symmetrically about the optical axis and method of making it | Herbert Pfeiffer | 1989-08-15 |
| 4784482 | Multifocal spectacle lens with high positive focal power | — | 1988-11-15 |
| 4504128 | Spectacle lens with high positive refractive power | Rudolf Barth, Werner Koppen | 1985-03-12 |
| 4315673 | Progressive power ophthalmic lens | Rudolf Barth | 1982-02-16 |