Number | Name | Date | Kind |
---|---|---|---|
3697034 | Shell | Oct 1972 | A |
5116007 | Von Gunton et al. | May 1992 | A |
5487246 | Hodges et al. | Jan 1996 | A |
5546277 | Zandbergen | Aug 1996 | A |
5791498 | Mills | Aug 1998 | A |
5833337 | Kofstad | Nov 1998 | A |
5899035 | Waalkes et al. | May 1999 | A |
6185092 | Landrum et al. | Feb 2001 | B1 |
6223916 | Enos | May 2001 | B1 |
6240687 | Chong | Jun 2001 | B1 |
6301846 | Waalkes et al. | Oct 2001 | B1 |
6546684 | Waalkes et al. | Apr 2003 | B2 |
6655534 | Williams et al. | Dec 2003 | B2 |
6684929 | MacDonald et al. | Feb 2004 | B2 |
6817147 | MacDonald | Nov 2004 | B1 |
6866154 | Hartman et al. | Mar 2005 | B2 |
6910306 | Waalkes et al. | Jun 2005 | B2 |
6948691 | Brock et al. | Sep 2005 | B2 |
7093725 | Hartman et al. | Aug 2006 | B2 |
7188916 | Silvestro et al. | Mar 2007 | B2 |
7204371 | Woolsey et al. | Apr 2007 | B2 |
7255409 | Hu et al. | Aug 2007 | B2 |
7281633 | Hartman et al. | Oct 2007 | B2 |
7284672 | Tsai | Oct 2007 | B2 |
7357362 | Yang et al. | Apr 2008 | B2 |
20030106863 | Lauchner et al. | Jun 2003 | A1 |