Number | Name | Date | Kind |
---|---|---|---|
4283985 | Famularo | Aug 1981 | |
5025697 | May | Jun 1991 | |
5546841 | Chen | Aug 1996 | |
5952594 | Chuang | Sep 1999 | |
6018116 | Simons et al. | Jan 2000 |
Number | Date | Country |
---|---|---|
913631 | Feb 1959 | GB |
Entry |
---|
Camco Catalog pp. 1 and 13, Dec. 1964. |