| Number | Date | Country | Kind |
|---|---|---|---|
| 2001-300373 | Sep 2001 | JP |
| Number | Name | Date | Kind |
|---|---|---|---|
| 2774185 | Kosch | Dec 1956 | A |
| 3572719 | Span et al. | Mar 1971 | A |
| 3783550 | Andrews | Jan 1974 | A |
| 4043558 | Star | Aug 1977 | A |
| 4200283 | Andrews et al. | Apr 1980 | A |
| 4200289 | Bosley | Apr 1980 | A |
| 4538999 | Orlowski | Sep 1985 | A |
| 4630822 | Massaglia | Dec 1986 | A |
| 4828258 | Gebert | May 1989 | A |
| 5135425 | Andrews et al. | Aug 1992 | A |
| 5518437 | Nonaka et al. | May 1996 | A |
| 6150913 | Simmons | Nov 2000 | A |
| Number | Date | Country |
|---|---|---|
| 2371496 | Jul 2002 | GB |
| 9-155067 | Jun 1997 | JP |
| Entry |
|---|
| Osawa, US 2002/0102907 A1, Aug. 1, 2002. |