Issued Patents 1989
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4851561 | Quaternary ammonium salts | Peter S. Alexandrovich | 1989-07-25 |
| 4840864 | New electrostatographic toners and developers containing new charge-control agents | Peter S. Alexandrovich, Lawrence P. DeMejo, Robert A. Guistina, James H. Anderson | 1989-06-20 |
| 4837392 | Dry electrostatographic developer containing toner particles comprising a vinyl addition polymer containing a covalently bound quaternary phosphonium salt | James H. Anderson, Lawrence P. DeMejo, Richard C. Sutton, John C. Wilson | 1989-06-06 |
| 4837391 | Dry electrostatographic developer containing toner particles comprising a vinyl addition polymer containing a covalently bound quaternary phosphonium salt | James H. Anderson | 1989-06-06 |
| 4834920 | New quaternary ammonium salts | Peter S. Alexandrovich, Lawrence P. DeMejo, Robert A. Guistina, James H. Anderson | 1989-05-30 |
| 4812382 | Electrostatographic toners and developers containing new charge-control agents | Peter S. Alexandrovich | 1989-03-14 |
| 4812378 | Electrostatographic toners and developers containing charge-control agents | Peter S. Alexandrovich, Lawrence P. DeMejo, Robert A. Guistina, James H. Anderson | 1989-03-14 |
| 4812380 | Electrostatographic toners and developers containing new charge-control agents | Peter S. Alexandrovich | 1989-03-14 |
| 4812381 | Electrostatographic toners and developers containing new charge-control agents | Peter S. Alexandrovich, Lawrence P. DeMejo, Robert A. Guistina | 1989-03-14 |
| 4806284 | New quaternary ammonium salts | Peter S. Alexandrovich, Lawrence P. De Mejo, Robert A. Guistina, James H. Anderson | 1989-02-21 |
| 4806283 | Quaternary ammonium salts | Peter S. Alexandrovich | 1989-02-21 |
| 4803017 | Quaternary ammonium salts | Peter S. Alexandrovich | 1989-02-07 |