Number | Date | Country | Kind |
---|---|---|---|
55/31150 | Mar 1980 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
2304940 | Mannes et al. | Dec 1942 | |
2322027 | Jelley et al. | Jun 1943 | |
2801171 | Fierke et al. | Jul 1957 | |
3619195 | Van Campen | Nov 1971 | |
4247627 | Chen | Jan 1981 |
Number | Date | Country |
---|---|---|
56-19043 | Feb 1981 | JPX |
56-19047 | Feb 1981 | JPX |
Entry |
---|
Research Disclosure, No. 15930, dated Jul. 1977. |