| Number | Name | Date | Kind |
|---|---|---|---|
| 336114 | Donahue | Jul 1888 | |
| 1190863 | Corne et al. | Jul 1916 | |
| 1458805 | Christensen | Jun 1923 | |
| 1732386 | Sprockhoff | Oct 1929 | |
| 1864911 | Jodeck | Jun 1932 | |
| 1946414 | Schmid | Feb 1934 | |
| 1946415 | Schmid | Feb 1934 | |
| 2014431 | Foster | Sep 1935 | |
| 2118157 | Camp | May 1938 | |
| 2207399 | Gaertner | Jul 1940 | |
| 2369194 | Weber | Feb 1945 | |
| 2673451 | Gariel | Mar 1954 | |
| 2868384 | Puddington | Jul 1955 | |
| 3067878 | Genter | Dec 1962 | |
| 3346122 | Cornelissen | Oct 1967 | |
| 3450264 | Graybill | Jun 1969 | |
| 3456798 | Urdanoff | Jul 1969 | |
| 3491892 | McCann | Jan 1970 | |
| 3552554 | Olgard | Jan 1971 | |
| 3563389 | Mizraki | Feb 1971 | |
| 3666112 | Pielkenroad | May 1972 | |
| 3721347 | Pielkenroad | Mar 1973 | |
| 3797668 | Pielkenroad | Mar 1974 | |
| 3837501 | Pielkenroad | Sep 1974 | |
| 3899427 | Connelly et al. | Aug 1975 | |
| 3914175 | Kunz et al. | Oct 1975 | |
| 3925205 | Sparham | Dec 1975 | |
| 4042512 | McCarthy | Aug 1977 | |
| 4213865 | Wagner | Jul 1980 | |
| 4337561 | James | Jul 1982 |
| Number | Date | Country |
|---|---|---|
| 1098155 | Jul 1902 | FRX |
| 1015977 | Oct 1952 | FRX |
| 907 | Jan 1886 | GBX |
| 17980 | Jan 1897 | GBX |
| 238007 | Aug 1925 | GBX |
| Entry |
|---|
| Clarification, Sedimentation, and Thickening Equipment-A Patent Review, by Barham, Matherne and Keller at p. 60, 1956. |