Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871661 | Process for testing the carcinogenicity of a material or the presence of cancer-inducing factors in an environment | Thomas E. Webb, Dorothy E. Schumm, Margaret Hanausek-Walaszek, Zbigniew Walaszek | 1989-10-03 |