Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4248760 | Method of obtaining composite materials and products, particularly for construction and building purposes, based on urea-formaldehyde resins by addition of phosphogypsum | Yordan T. Simeonov, Georgi Z. Zahariev | 1981-02-03 |