Number | Date | Country | Kind |
---|---|---|---|
2-259828 | Sep 1990 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
26415 | Noerdlinger et al. | Nov 1907 | |
2710880 | Filachione et al. | Jun 1955 | |
4250331 | Shimshick | Feb 1981 |
Number | Date | Country |
---|---|---|
688245 | Jun 1964 | CAX |
0016899 | Oct 1980 | EPX |
43618 | Dec 1960 | PLX |
537712 | Sep 1946 | GBX |
Entry |
---|
Patent Abstracts of Japan, vol. 14, No. 254 (C-274) (4197), 31 May 1990 of JP-A-2-72,138 (Res. Assoc. Util. of Light Oil) 12 Mar. 1990. |