Issued Patents All Time
Showing 1–25 of 55 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5892051 | Additives for lubricants | Hans-Helmut Friedrich | 1999-04-06 |
| 5618778 | Additives for lubricants | Hans-Helmut Friedrich | 1997-04-08 |
| 5550276 | Phosphonic acid derivatives and thionophosphonic acid derivatives | Hans-Helmut Friedrich, Kay S. Groninger | 1996-08-27 |
| 5481039 | "Compositions comprising 2,2',2""-nitrilotriethanol cyclometalates" | Hans-Helmut Friedrich | 1996-01-02 |
| 5380344 | "Compositions comprising 2,2',2""-nitrilotriethanol cyclometalates" | Hans-Helmut Friedrich | 1995-01-10 |
| 5350785 | Stabilized chlorine-containing polymer compositions | Hans Sander, Olaf Hartmann, Wolfgang Wehner | 1994-09-27 |
| 5283273 | Stabilized chlorine-containing polymers | Hans Sander, Olaf Hartmann | 1994-02-01 |
| 5256323 | "Compositions containing 2,2',2""-nitrilotriethanol cyclometalates" | Hans-Helmut Friedrich | 1993-10-26 |
| 5244949 | Stabilized chlorine-containing polymers | Hans Sander, Olaf Hartmann | 1993-09-14 |
| 5177135 | .beta.-keto esters as stabilizers for chlorinated polymers | Wolfgang Wehner | 1993-01-05 |
| 5155152 | Substitute aminopyrroles as stabilizers for chlorine-containing polymers | Wolfgang Wehner | 1992-10-13 |
| 5073277 | Lubricants containing ammonium salts of methylphosphonic acid | Klaus Muller | 1991-12-17 |
| 5071898 | Propane-1,3-dione derivatives and their use as stabilizers for polymers containing chlorine | Hans-Helmut Friedrich, Gerd Abeler | 1991-12-10 |
| 5059313 | Conveyor rake sieve with hook-like plates | Helmut Etschel | 1991-10-22 |
| 5021474 | Latent hardeners for melamine resin moulding compositions | Peter Gunther, Wilhelm Endlich | 1991-06-04 |
| 5002698 | Sulfur- and nitrogen-containing lubricant additives | Hans-Helmut Friedrich | 1991-03-26 |
| 4992504 | Ether-containing or thioether-containing 1,3-diketones and the use thereof as stabilizers for chlorine-containing polymers | Hans-Helmut Friedrich | 1991-02-12 |
| 4962227 | Methylphosphonic acid amine salt lubricant additives | Klaus Muller | 1990-10-09 |
| 4943381 | Nitrogen-containing additives for non-aqueous functional fluids | Emyr Phillips, Robert Neil | 1990-07-24 |
| 4931576 | Process for producing glycidyl thioethers | Hans-Helmut Friedrich | 1990-06-05 |
| 4925887 | Latent hardeners for melamine resin moulding compositions | Peter Gunther, Wilhelm Endlich | 1990-05-15 |
| 4889938 | 1,4-Oxathianones and 1,4-oxathiepanones | Ulrich Kristen | 1989-12-26 |
| 4886610 | Lubricant compositions, novel glucamine derivatives and complex compounds containing same | Hans-Helmut Friedrich | 1989-12-12 |
| 4876029 | Substituted and unsubstituted ring-bridged para-oligophenylene UV laser dyes | Hans Gusten, Hans-Joachim Ache, Monika Rinke | 1989-10-24 |
| 4863621 | Sulfur-and nitrogen-containing lubricant additives | Hans-Helmut Friedrich | 1989-09-05 |