Number | Date | Country | Kind |
---|---|---|---|
53/7760 | Jan 1978 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
3689559 | Taylor eet al. | Sep 1972 | |
3855306 | Wehrli | Dec 1974 | |
3996291 | Dietrich et al. | Dec 1976 | |
4085147 | Rosinger et al. | Apr 1978 |
Number | Date | Country |
---|---|---|
853411 | Sep 1976 | BEX |
Entry |
---|
Derwent, Central Patents Index, 72509Y/41. |