Issued Patents All Time
Showing 1–20 of 20 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5092183 | Device for cooling testing tubes | — | 1992-03-03 |
| 5093269 | Process and arrangement for determining at least one component of a test gas | Hans Matthiessen | 1992-03-03 |
| 5069879 | Automated apparatus for detecting gaseous components in air with a colorimetric testing tube | Wolfgang May, Wolfgang Bather, Wolfgang Evers | 1991-12-03 |
| 4793173 | Process for calibrating a gas metering instrument | Benno Moreth | 1988-12-27 |
| 4769218 | Test tube with flame arrester for combustible gases | Hans Matthiessen | 1988-09-06 |
| 4748930 | Colorimetric gas dosimeter | — | 1988-06-07 |
| 4723436 | Process for calibrating a gas metering instrument | Benno Moreth | 1988-02-09 |
| 4684380 | Colorimetric indicator for the indication of the exhaustion of gas filters | — | 1987-08-04 |
| 4554133 | Gas measuring testing tube | — | 1985-11-19 |
| 4528160 | Gas dosimeter construction | Wolfgang Eckstein, Karl-Heinz Pannwitz, Horst Rabenecker, Gunter Wolff | 1985-07-09 |
| 4460544 | Test tube for the measurement of oil mists | — | 1984-07-17 |
| 4332771 | Method and device for determining the alcohol content of a person's breathing | — | 1982-06-01 |
| 4330297 | Test tube construction and method for measuring for nickel aerosols | — | 1982-05-18 |
| 4329153 | Test tube construction and method for testing for copper aerosols | — | 1982-05-11 |
| 4294583 | Highly sensitive gas measuring method for the analysis of breath alcohol concentrations, using test tubes | — | 1981-10-13 |
| 4277251 | Method and device for determining the alcohol content of a person's breathing | — | 1981-07-07 |
| 4271125 | Indicator device for the quantitative determination of metal cyanides in aerosol form | — | 1981-06-02 |
| 4259287 | Testing tube construction for measuring sodium hydroxide and/or calcium oxide | — | 1981-03-31 |
| 4254657 | Gas detector and meter employing indicator tubes | Peter Naumann | 1981-03-10 |
| 4230457 | Apparatus and method for measuring aerosols and gases with detector tubes | — | 1980-10-28 |