Issued Patents All Time
Showing 26–50 of 64 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6162936 | Organometallic fluorenyl compounds, preparation, and use | Helmut G. Alt, Konstantinos Patsidis, M. Bruce Welch, Rolf L. Geerts, Eric T. Hsieh +3 more | 2000-12-19 |
| 6153716 | Polyethylenes containing a unique distribution of short chain branching | M. Bruce Welch, Helmut G. Alt, Bernd Peifer, Gary L. Glass, Ted M. Pettijohn +2 more | 2000-11-28 |
| 6124414 | Fluorenyl-containing polymeric metallocene catalyst systems | Bernd Peifer, M. Bruce Welch, Helmut G. Alt, Peter Schertl | 2000-09-26 |
| 6096915 | Processes to produce organo-aluminoxane compositions | M. Bruce Welch, Rolf L. Geerts | 2000-08-01 |
| 6057410 | Polymeric ligands, polymeric metallocenes, catalyst systems, preparation, and use | Helmut G. Alt, Peter Schertl, Bernd Peifer, M. Bruce Welch | 2000-05-02 |
| 6040402 | Polymeric ligands, polymeric metallocenes, catalyst systems, preparation, and use | Bernd Peifer, M. Bruce Welch, Helmut G. Alt, Peter Schertl | 2000-03-21 |
| 5990035 | Polymerization catalyst systems, their preparation, and use | Alexander Koppl, Helmut G. Alt, M. Bruce Welch | 1999-11-23 |
| 5770755 | Process to prepare polymeric metallocenes | Peter Schertl, Helmut G. Alt, Bernd Peifer, M. Bruce Welch | 1998-06-23 |
| 5710224 | Method for producing polymer of ethylene | Helmut G. Alt, M. Bruce Welch, David C. Rohlfing, Jay Janzen | 1998-01-20 |
| 5670589 | Organoaluminoxy product, catalyst systems, preparation, and use | Rolf L. Geerts, M. Bruce Welch, Helmut G. Alt, Bernd Peifer, Harold R. Deck | 1997-09-23 |
| 5627118 | Silyl bridged metallocenes and use thereof | Helmut G. Alt, Konstantinos Patsidis, Tara G. Hill, Gil R. Hawley, Peter P. Chu +2 more | 1997-05-06 |
| 5627247 | Organometallic fluorenyl compounds and use thereof in olefin polymerization | Helmut G. Alt, Gil R. Hawley, Paul D. Smith, Michael Schmid, M. Bruce Welch +4 more | 1997-05-06 |
| 5616752 | Metallocenes and processes therefor and therewith | Konstantinos Patsidis, Bernd Peifer, Helmut G. Alt, Rolf L. Geerts, Darryl R. Fahey +2 more | 1997-04-01 |
| 5610247 | Unbridged metallocenes of 9-substituted fluorenyl compounds and use thereof | Helmut G. Alt, Konstantinos Patsidis, M. Bruce Welch, Rolf L. Geerts, Eric T. Hsieh +5 more | 1997-03-11 |
| 5594078 | Process for producing broad molecular weight polyolefin | M. Bruce Welch, Rolf L. Geerts, Ted M. Pettijohn | 1997-01-14 |
| 5583189 | Polymerization processes | Rolf L. Geerts, Ted M. Pettijohn, Robert M. Infield | 1996-12-10 |
| 5571880 | Organometallic fluorenyl compounds and use thereof in an alpha-olefin polymerization process | Helmut G. Alt, Roland Zenk, M. Bruce Welch, Michael Schmid | 1996-11-05 |
| 5565592 | Vinly-substituted bridged metallocenes | Konstantinos Patsidis, Bernd Peifer, Helmut G. Alt, M. Bruce Welch, Rolf L. Geerts +2 more | 1996-10-15 |
| 5541351 | Cyclopentadiene type compounds and method for making | Konstantinos Patsidis, Helmut G. Alt | 1996-07-30 |
| 5534473 | Catalyst systems for producing broad molecular weight polyolefin | M. Bruce Welch, Rolf L. Geerts, Ted M. Pettijohn | 1996-07-09 |
| 5498581 | Method for making and using a supported metallocene catalyst system | M. Bruce Welch, Helmut G. Alt, Bernd Peifer, Gary L. Glass, Ted M. Pettijohn +2 more | 1996-03-12 |
| 5496781 | Metallocene catalyst systems, preparation, and use | Rolf L. Geerts, Ted M. Pettijohn, Robert M. Infield | 1996-03-05 |
| 5492973 | Polymer bound ligands | Bernd Peifer, Helmut G. Alt, M. Bruce Welch | 1996-02-20 |
| 5492978 | Process for preparing catalyst system | Bernd Peifer, Helmut G. Alt, M. Bruce Welch | 1996-02-20 |
| 5492985 | Polymerization processes | Bernd Peifer, Helmut G. Alt | 1996-02-20 |