Issued Patents All Time
Showing 25 most recent of 26 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6372930 | Polymeric ligands, polymeric metallocenes, catalyst systems, preparation, and use | Peter Schertl, Helmut G. Alt, M. Bruce Welch, Syriac J. Palackal | 2002-04-16 |
| 6153716 | Polyethylenes containing a unique distribution of short chain branching | M. Bruce Welch, Helmut G. Alt, Syriac J. Palackal, Gary L. Glass, Ted M. Pettijohn +2 more | 2000-11-28 |
| 6124414 | Fluorenyl-containing polymeric metallocene catalyst systems | Syriac J. Palackal, M. Bruce Welch, Helmut G. Alt, Peter Schertl | 2000-09-26 |
| 6057410 | Polymeric ligands, polymeric metallocenes, catalyst systems, preparation, and use | Helmut G. Alt, Peter Schertl, Syriac J. Palackal, M. Bruce Welch | 2000-05-02 |
| 6040402 | Polymeric ligands, polymeric metallocenes, catalyst systems, preparation, and use | Syriac J. Palackal, M. Bruce Welch, Helmut G. Alt, Peter Schertl | 2000-03-21 |
| 5830958 | Polynuclear metallocene preparation and use | Helmut G. Alt, M. Bruce Welch | 1998-11-03 |
| 5770663 | Metallocene preparation and use | Helmut G. Alt, M. Bruce Welch | 1998-06-23 |
| 5770755 | Process to prepare polymeric metallocenes | Peter Schertl, Helmut G. Alt, Syriac J. Palackal, M. Bruce Welch | 1998-06-23 |
| 5744666 | Process for preparing an alkynyl fulvene group containing compound and said compound | M. Bruce Welch, Helmut G. Alt | 1998-04-28 |
| 5728908 | Process for preparing a bridged ligand and said bridged ligand | M. Bruce Welch, Helmut G. Alt | 1998-03-17 |
| 5712404 | Cyclopentadienyl-type ligands, metallocene compounds catalyst systems, preparation and use | Helmut G. Alt, M. Bruce Welch | 1998-01-27 |
| 5705578 | Method for making and using a supported metallocene catalyst system | Helmut G. Alt, M. Bruce Welch | 1998-01-06 |
| 5670589 | Organoaluminoxy product, catalyst systems, preparation, and use | Rolf L. Geerts, M. Bruce Welch, Syriac J. Palackal, Helmut G. Alt, Harold R. Deck | 1997-09-23 |
| 5654454 | Metallocene preparation and use | Helmut G. Alt, M. Bruce Welch | 1997-08-05 |
| 5631203 | Metallocene compounds and preparation thereof containing terminal alkynes | M. Bruce Welch, Helmut G. Alt | 1997-05-20 |
| 5616752 | Metallocenes and processes therefor and therewith | Konstantinos Patsidis, Helmut G. Alt, Rolf L. Geerts, Darryl R. Fahey, M. Bruce Welch +2 more | 1997-04-01 |
| 5565592 | Vinly-substituted bridged metallocenes | Konstantinos Patsidis, Syriac J. Palackal, Helmut G. Alt, M. Bruce Welch, Rolf L. Geerts +2 more | 1996-10-15 |
| 5498581 | Method for making and using a supported metallocene catalyst system | M. Bruce Welch, Helmut G. Alt, Syriac J. Palackal, Gary L. Glass, Ted M. Pettijohn +2 more | 1996-03-12 |
| 5492975 | Polymer bound metallocenes | Helmut G. Alt, M. Bruce Welch, Syriac J. Palackal | 1996-02-20 |
| 5492978 | Process for preparing catalyst system | Helmut G. Alt, M. Bruce Welch, Syriac J. Palackal | 1996-02-20 |
| 5492985 | Polymerization processes | Helmut G. Alt, Syriac J. Palackal | 1996-02-20 |
| 5492973 | Polymer bound ligands | Helmut G. Alt, M. Bruce Welch, Syriac J. Palackal | 1996-02-20 |
| 5492974 | Process for preparing polymer bound metallocenes | Helmut G. Alt, M. Bruce Welch, Syriac J. Palackal | 1996-02-20 |
| 5473020 | Polymer bound ligands, polymer bound metallocenes, catalyst systems, preparation, and use | Helmut G. Alt, M. Bruce Welch, Syriac J. Palackal | 1995-12-05 |
| 5466766 | Metallocenes and processes therefor and therewith | Konstantinos Patsidis, Syriac J. Palackal, Helmut G. Alt, M. Bruce Welch, Rolf L. Geerts +2 more | 1995-11-14 |