Issued Patents 1989
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870795 | Ceramic wall or floor covering consisting of single tile-shaped elements | Hans G. Baumgart | 1989-10-03 |
| 4868899 | Space heating element comprising a ceramic shaped body provided with an electrically resistive coating, in particular in the form of a ceramic tile | Gottfried Cremer | 1989-09-19 |
| 4853167 | Method for making lead pencils and colored pencils | Rosemarie Rieger, Isfried Petzenhauser | 1989-08-01 |
| 4839500 | Covering for wall, ceiling or floor linings | Gottfried Cremer | 1989-06-13 |
| 4833300 | Space heating element having a ceramic body with an electrically resistive coating thereon | Gottfried Cremer | 1989-05-23 |
| 4821484 | Double floor construction | Gottfried Cremer | 1989-04-18 |
| 4821478 | Large-format ceramic tile with holding elements provided on the side facing away from its visible side | Gottfried Cremer | 1989-04-18 |
| 4815248 | Large-format thin-walled ceramic tile | — | 1989-03-28 |
| 4806420 | Unglazed ceramic tile-shaped article | — | 1989-02-21 |