|
| US4290912 | 21 Feb 1980 | 22 Sep 1981 | Northern Instruments Corporation | Volatile corrosion inhibiting article |
| US4321297 | 23 Mar 1981 | 23 Mar 1982 | The Crowell Corporation | Sheet packaging material |
| US5948357 | 29 May 1997 | 7 Sep 1999 | International Paper Company | Heat resistant paper interleaver for sheet metal |
| US7261839 | 1 Oct 2003 | 28 Aug 2007 | Northern Technologies International Corp. | Tarnish inhibiting composition and article containing it |
| US7270775 | 1 Oct 2003 | 18 Sep 2007 | Northern Technologies International Corp. | Corrosion inhibiting composition and article containing it |
| US8008373 | 31 Oct 2007 | 30 Aug 2011 | Northern Technologies International Corp. | Biodegradable polymer masterbatch, and a composition derived therefrom having improved physical properties |