| 2250508 | Treating zinc with organic acids | |||
| 2469493 | Synthetic detergent composition | |||
| 2493327 | Aqueous composition for treating iron and steel | |||
| 2552874 | Method of phosphatizing ferriferous surfaces | |||
| 2860106 | Urea-phosphoric acid cleaning composition | |||
| 3011907 | Process for treating ferrous metals | |||
| 3070464 | Cleaning magnesium articles |