| Number | Name | Date | Kind |
|---|---|---|---|
| 220429 | Russell | Oct 1879 | |
| 435604 | Hasselman | Sep 1890 | |
| 438797 | Blair | Oct 1890 | |
| 469017 | Hodsdon | Feb 1892 | |
| 574519 | Boughton | Jan 1897 | |
| 1045854 | Kevitt et al. | Dec 1912 | |
| 1449780 | Reinhold | Mar 1923 | |
| 1828642 | Bunker | Oct 1931 | |
| 1917629 | Anderson | Jul 1933 | |
| 2820256 | Dahl | Jan 1958 | |
| 2837777 | White | Jun 1958 | |
| 3733759 | Schulte et al. | May 1973 | |
| 4037385 | Wahlquist | Jul 1977 | |
| 4380836 | Braxton | Apr 1983 | |
| 4467572 | Somers et al. | Aug 1984 | |
| 5630302 | Roseband | May 1997 |
| Number | Date | Country |
|---|---|---|
| 77850 | Aug 1949 | CZ |
| 2090404 | Jan 1972 | FR |
| 640518 | Jul 1950 | GB |
| 638425 | Apr 1962 | IT |
| 2-272126 | Nov 1990 | JP |
| Entry |
|---|
| International Search Report dated Nov. 11, 1999, PCT Appl. No. PCT/US99/17180. |