| 10527537 |
System and method for optimizing selection of an air filter |
Dirk ter Horst |
2020-01-07 |
| 10143951 |
Embossed fluid filter treatment |
Dirk ter Horst |
2018-12-04 |
| 9546942 |
System and method for optimizing selection of an air filter |
Dirk ter Horst |
2017-01-17 |
| 9314717 |
Embossed fluid filter element |
Dirk ter Horst |
2016-04-19 |
| 6997969 |
Filter material and method |
Dirk Horst |
2006-02-14 |
| 6685833 |
Fluid filter element |
— |
2004-02-03 |
| 6299660 |
Accordion filter with a protective mask |
Peter Pfeuffer, Markus Fronhofer, Hans Leibold |
2001-10-09 |
| 6274039 |
Cartridge filter with frame |
Andreas Brandhofer, Matthias Schuster |
2001-08-14 |
| 6059966 |
Cartridge filter with frame |
Andreas Brandhofer, Matthias Schuster, Jorgen Knudsen, Margit Hofmann |
2000-05-09 |
| 5290447 |
Block-shaped pleated filter insert |
— |
1994-03-01 |
| 5089202 |
Method for the production of a filter cartridge |
— |
1992-02-18 |
| 5066319 |
Filter cartridge |
— |
1991-11-19 |
| 5053131 |
Filter cartridge |
— |
1991-10-01 |
| 5028331 |
Filter cartridge |
— |
1991-07-02 |