| Number | Name | Date | Kind |
|---|---|---|---|
| 1075731 | Schuler | Oct 1913 | A |
| 1119015 | Hatch | Dec 1914 | A |
| 1162718 | Dean | Nov 1915 | A |
| 1276700 | Kleeman | Aug 1918 | A |
| 2553241 | Dache | May 1951 | A |
| 2762055 | Bermueller | Sep 1956 | A |
| 2830300 | Schwartz | Apr 1958 | A |
| 2852781 | Ganser | Sep 1958 | A |
| 2908913 | Sobel | Oct 1959 | A |
| 2938215 | Schwartz | May 1960 | A |
| 3020557 | Sobel | Feb 1962 | A |
| 3114374 | Chalfin et al. | Dec 1963 | A |
| 3129435 | Spence | Apr 1964 | A |
| 3702614 | Miller | Nov 1972 | A |
| 3777763 | Schwartz | Dec 1973 | A |
| 3799175 | Rowell | Mar 1974 | A |
| 4133316 | Schwartz | Jan 1979 | A |
| 6106363 | Werner | Aug 2000 | A |
| Number | Date | Country |
|---|---|---|
| 26 31 136 | Jul 1976 | DE |
| 1 053 692 | Sep 2000 | EP |
| 7090702 | Apr 1995 | JP |
| Entry |
|---|
| EPO Office Letter/Search Report Nov. 26, 2001. |