Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871422 | Etching solutions containing ammonium fluoride and anionic sulfate esters of alkylphenol polyglycidol ethers and method of etching | Thomas S. Roche | 1989-10-03 |
| 4863563 | Etching solutions containing ammonium fluoride and a nonionic alkyl amine glycidol adduct and method of etching | Thomas S. Roche | 1989-09-05 |
| 4827028 | Anionic surfactants | Richard M. Mullins | 1989-05-02 |