Number | Name | Date | Kind |
---|---|---|---|
1663810 | Morse | Mar 1928 | |
3629774 | Crites | Dec 1971 | |
4054540 | Michalchik | Oct 1977 | |
4279188 | Scott | Jul 1981 | |
4503416 | Kim | Mar 1985 | |
4739299 | Eventoff | Apr 1988 | |
4845457 | Nakanishi | Jul 1989 | |
4847586 | Tanaga et al. | Jul 1989 | |
4990755 | Nishimura | Feb 1991 | |
5550339 | Haugh | Aug 1996 |
Number | Date | Country |
---|---|---|
505731 | Feb 1992 | EPX |
532814 | Mar 1993 | EPX |
Entry |
---|
WPI English language Abstract of EP 532,814. |