Number | Date | Country | Kind |
---|---|---|---|
90 09271 | Jul 1990 | FRX |
Number | Name | Date | Kind |
---|---|---|---|
4323662 | Oba et al. | Apr 1982 |
Number | Date | Country |
---|---|---|
273839 | Jun 1988 | FRX |
2608612 | Jun 1988 | FRX |
284524 | Sep 1988 | FRX |
334771 | Sep 1989 | FRX |
Entry |
---|
Patent Abstracts of Japan vol. 14, No. 176, Apr. 9, 1990 (Sumitimo Bakelite Co Ltd). |