Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5899300 | Mounting for an elevator traction machine | William Miller, Dwight G. Covey | 1999-05-04 |
| 5665852 | Substituted urea and oxime modified amino crosslinking agents, curable compositions containing the same and process for preparing pyrrolidone urea | Balwant Singh, Laurence W. Chang, Stephen Donovan | 1997-09-09 |
| 5418284 | Surface-modified polyacrylonitrile beads | Laurence W. Chang, David A. Ley | 1995-05-23 |
| 5306782 | Surface-modified polyacrylonitrile fibrous substrates | Laurence W. Chang, David A. Ley | 1994-04-26 |
| 5306632 | Porous acrylonitrile polymer substrate for bonding ligands and separating biologically active substances | Michael Cooke, David A. Ley | 1994-04-26 |
| 5284911 | Surface-modified polyacrylonitrile substrates | Laurence W. Chang, David A. Ley | 1994-02-08 |
| 5284910 | Surface-modified polyacrylonitrile fibrous substrates | Laurence W. Chang, David A. Ley | 1994-02-08 |
| 5270384 | Surface-modified polyacrylonitrile fibrous substrates | Laurence W. Chang, David A. Ley | 1993-12-14 |
| 5268421 | Surface-modified polyacrylonitrile beads | Laurence W. Chang, David A. Ley | 1993-12-07 |
| 5194512 | Surface-modified polyacrylonitrile substrates | Laurence W. Chang, David A. Ley | 1993-03-16 |
| 5155174 | Surface-modified polyacrylonitrile fibrous substrates | Laurence W. Chang, David A. Ley | 1992-10-13 |
| 5137983 | Surface-modified polyacrylonitrile beads | Laurence W. Chang, David A. Ley | 1992-08-11 |
| 5082904 | Surface-modified polyacrylonitrile substrates | Laurence W. Chang, David A. Ley | 1992-01-21 |