Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4687799 | Compositions of polyphenylene oxide or of mixtures of polyphenylene oxide with a styrene polymer | Wanda Kosinska, Dorota Grzelak, Irena Penczek | 1987-08-18 |
| 4607085 | Process for the production of polyphenylene-oxide | Irena Penczek, Zbingniew Dobkowski | 1986-08-19 |
| 4568662 | Process for preparing alkylation catalysts | Irena Penczek, Nikuca Kopytowska, Josef Wrzyszcz, Jolanta Cmielowska, Hanna Grabowska +3 more | 1986-02-04 |
| 4568776 | Process for purifying 2,6-xylenol | Jerzy Bialek, Marek Plesnar, Janina Werle | 1986-02-04 |
| 4556699 | Process for the production of polyphenylene oxide | Irena Penczek, Stanislaw Maczenski, Marek Borensztajn | 1985-12-03 |