Issued Patents All Time
Showing 1–18 of 18 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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, Ludwig Ross, Burkhard Speit, Volkmar Geiler, Hans-Georg Krolla +1 more | 1988-01-12 |
| 4686196 | Phototropic glass with a refractive index greater than or equal to 1.59, an abbe number greater than or equal to 44 and a density less than or equal to 3.0 g/cm.sup.3 | Ludwig Ross, Uwe Eichhorn, Eva Hoelzel, Burkhard Speit | 1987-08-11 |
| 4584279 | Optical glass with refractive indices>1.90, Abbe numbers>25 and high chemical stability | Danuta Grabowski, Ludwig Ross, Volkmar Geiler, Karl Mennemann | 1986-04-22 |
| 4566987 | Scintillation glass | Burkhard Speit, Hans-Georg Krolla | 1986-01-28 |
| 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, Ludwig Ross, Burkhard Speit, Volkmar Geiler, Hans-Georg Krolla +1 more | 1985-12-31 |
| 4520115 | High absorbance Pb-containing glass for cathode ray tube picture screen | Burkhard Speit, Karl Mennemann | 1985-05-28 |
| 4508834 | Spectacle glass with increased refractive index | Ludwig Ross, Burkhard Speit, Volkmar Geiler, Hans-Georg Krolla, Lothar Meckel | 1985-04-02 |
| 4485178 | Phototropic glass with a brown tint in the irradiated state | Uwe Eichhorn, Eva Holzel, Ludwig Ross, Hans-Georg Krolla, Burkhard Speit +2 more | 1984-11-27 |
| 4473612 | Flashed glass | Werner Behr, Klaus Hanke | 1984-09-25 |
| 4438211 | Optical and ophthalmic glass with refractive indices nd>1.58, Abbe numbers>45 and densities<2.75 g/cm.sup.3 | Karl Mennemann, Volkmar Geiler | 1984-03-20 |
| 4400473 | Acidproof, hydrolysis-resistant optical and ophathalmic glass of low density | Karl Mennemann, Volkmar Geiler | 1983-08-23 |
| 4390638 | Acidproof, hydrolysis-resistant optical and ophthalmic glass of low density | Karl Mennemann, Volkmar Geiler | 1983-06-28 |
| 4243299 | Optical fibers for communication transmission having high stability to nuclear radiation | Lothar Meckel, Peter Heinemann | 1981-01-06 |
| 4213787 | High refractive index glasses of limited specific gravity for distance and near vision spectacle lenses | Marga Faulstich, Volkmar Geiler | 1980-07-22 |
| 4213786 | Lightweight, high refractive index glasses for spectacle lenses | Marga Faulstich, Volkmar Geiler | 1980-07-22 |
| 4199335 | Process for the production of optical fibers for transmission of communication | Lothar Meckel | 1980-04-22 |
| 4194807 | Optical fiber wave-guides for signal transmission comprising multiple component glass with an adjusted expansion co-efficient between the core and mantle | — | 1980-03-25 |
| 4188089 | Optical fibers having high infrared transmittancy | Lothar Meckel | 1980-02-12 |