Issued Patents All Time
Showing 1–19 of 19 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5759930 | Substantially spherical particles of lithium silicates with improved mechanical properties and improved surface quality | Mario Dalle Donne, Guster Schumacher, Marc Clement, Burkhart Speit | 1998-06-02 |
| 5589427 | Substantially spherical particles of lithium silicates with improved mechanical properties and impaired surface quality | Mario Dalle Donne, Guster Schumacher, Marc Clement, Burkhart Speit | 1996-12-31 |
| 5137850 | Optical glass of negative anomalous partial dispersion in the blue region | Marc Clement, Danuta Grabowski | 1992-08-11 |
| 5100843 | Optical glass with negative anomalous partial dispersion | Danuta Grabowski, Marc Clement | 1992-03-31 |
| 4814299 | Optical glass with refractive index 1.60, an abbe number 58, with high chemical stability and resistance to phase separation and crystallization | Ludwig Ross | 1989-03-21 |
| 4734389 | Highly refractive optical glass with refractive indices >1.83 and Abbe numbers <25, and with very good chemical stability | Danuta Grabowski, Ludwig Ross | 1988-03-29 |
| 4721690 | High PbO-content glasses in the system SiO.sub.2 --PbO--M.sub.2 O with increased chemical stability | Ludwig Ross, Danuta Grabowski, Burkhard Speit | 1988-01-26 |
| 4719186 | Optical and ophthalmic glass with refractive indices greater than or equal to 1.56, Abbe numbers greater than or equal to 40 and densities less than or equal to 2.70 g/cm.sup.3 | Karl Mennemann, Georg Gliemeroth, Ludwig Ross, Burkhard Speit, Hans-Georg Krolla +1 more | 1988-01-12 |
| 4584279 | Optical glass with refractive indices>1.90, Abbe numbers>25 and high chemical stability | Danuta Grabowski, Ludwig Ross, Karl Mennemann, Georg Gliemeroth | 1986-04-22 |
| 4562161 | Optical and ophthalmic glass with refractive indices greater than or equal to 1.56, Abbe numbers greater than or equal to 40 and densities less than or equal to 2.70 g/cm.sup.3 | Karl Mennemann, Georg Gliemeroth, Ludwig Ross, Burkhard Speit, Hans-Georg Krolla +1 more | 1985-12-31 |
| 4526874 | Optical light weight glass with a refractive index of >1.70, an Abbe index of >22 and a density of <3.5 G/CM.sup.3 | Danuta Grabowski geb. Marszalek, Ludwig Ross, Karl Mennemann | 1985-07-02 |
| 4508834 | Spectacle glass with increased refractive index | Georg Gliemeroth, Ludwig Ross, Burkhard Speit, Hans-Georg Krolla, Lothar Meckel | 1985-04-02 |
| 4485178 | Phototropic glass with a brown tint in the irradiated state | Georg Gliemeroth, Uwe Eichhorn, Eva Holzel, Ludwig Ross, Hans-Georg Krolla +2 more | 1984-11-27 |
| 4439531 | CdO-ThO.sub.2 -Free, highly refractive optical glass | Karl Mennemann | 1984-03-27 |
| 4438211 | Optical and ophthalmic glass with refractive indices nd>1.58, Abbe numbers>45 and densities<2.75 g/cm.sup.3 | Karl Mennemann, Georg Gliemeroth | 1984-03-20 |
| 4400473 | Acidproof, hydrolysis-resistant optical and ophathalmic glass of low density | Karl Mennemann, Georg Gliemeroth | 1983-08-23 |
| 4390638 | Acidproof, hydrolysis-resistant optical and ophthalmic glass of low density | Karl Mennemann, Georg Gliemeroth | 1983-06-28 |
| 4213786 | Lightweight, high refractive index glasses for spectacle lenses | Marga Faulstich, Georg Gliemeroth | 1980-07-22 |
| 4213787 | High refractive index glasses of limited specific gravity for distance and near vision spectacle lenses | Marga Faulstich, Georg Gliemeroth | 1980-07-22 |