Issued Patents All Time
Showing 25 most recent of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6375721 | Ionization filter for purifying air | — | 2002-04-23 |
| 5476536 | Process for removing harmful hydrocarbons, particularly plant protective aerosols and vapors, from the fresh air supplied to a vehicle cabin | — | 1995-12-19 |
| 5223325 | Filter medium | Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert | 1993-06-29 |
| 5165600 | Ventilation system for the cab of a tractor used in a spraying system | — | 1992-11-24 |
| 5066466 | Apparatus for indicating the presence of toxic substances in air that is supplied to a personnel-occupied space | Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert, Hanns Rump | 1991-11-19 |
| 5015451 | Process, filter and device for making available high-quality breathing air | Heinrich Igelbuscher, Heinrich Gresch | 1991-05-14 |
| 4992965 | Circuit arrangement for the evaluation of a signal produced by a semiconductor gas sensor | Hanns Rump, Helmut Vietze | 1991-02-12 |
| 4941824 | Method of and apparatus for cooling and cleaning the roof and environs of a coke oven | Heinrich Igelbuscher, Heinrich Gresch | 1990-07-17 |
| 4936881 | Cooling tower for steam-powered plants | Sigurd Jorzyk, Gerhard Scholl, Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert | 1990-06-26 |
| 4930407 | Sensing system for controlling air circulation valves in motor vehicles | Hanns Rump | 1990-06-05 |
| 4886000 | Method of treating waste | Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert | 1989-12-12 |
| 4885011 | Cooling tower for the cooling water that drains/ from the condensor of a steam generator or the condensors/ of a plurality of steam generators | Sigurd Jorzyk, Gerhard Scholl, Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert | 1989-12-05 |
| 4882287 | Process for indicating the presence of toxic substances in air that is supplied to a personnel-occupied space | Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert, Hanns Rump | 1989-11-21 |
| 4875406 | Device for detecting different pollutants in gas streams | Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert, Peter Burggraf | 1989-10-24 |
| 4832936 | Process for making calcium sulfate dihydrate or gypsum | Georg R. U. Gebhard | 1989-05-23 |
| 4802573 | Process for wet quenching of coke | Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert | 1989-02-07 |
| 4784810 | Smoke gas exhaust by way of a cooling tower | Sigurd Jorzyk, Gerhard Scholl, Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert | 1988-11-15 |
| 4744289 | Cab for occupancy by individuals | Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert, Joachim Tischendorf | 1988-05-17 |
| 4742763 | Device for the detection of noxious substances in the air supplied to a compartment occupied by people | Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert | 1988-05-10 |
| 4733605 | Process and device for purifying polluted air | Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert | 1988-03-29 |
| 4670234 | Process for stripping nitrogen oxides and sulphur oxides as well as optionally other noxious elements of flue gas from combustion plants | Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert | 1987-06-02 |
| 4551304 | Method of cleaning air loaded with pollutants | Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert | 1985-11-05 |
| 4530817 | Apparatus for the protection of air fed to a labor-protection or vehicle compartment | Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert | 1985-07-23 |
| 4451435 | Apparatus for cleaning air loaded with pollutants | Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert | 1984-05-29 |
| 4432776 | Process for filtering separators in dry chemisorption | Heinz Gresch, Heinrich Igelbuscher | 1984-02-21 |