Number | Name | Date | Kind |
---|---|---|---|
2677749 | Kiba | May 1954 | |
2734222 | Kiba | Feb 1956 | |
3902628 | Schurman | Sep 1975 | |
3933269 | Mastrovito | Jan 1976 | |
4741032 | Hampton | Apr 1988 | |
4809874 | Pehr | Mar 1989 | |
4985962 | Weber | Jan 1991 | |
5125523 | Kulper | Jun 1992 | |
5146650 | Robertson | Sep 1992 | |
5628422 | Garbacik, Jr. et al. | May 1997 |
Entry |
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Robert Milby, Plastics Technology, USPTO Scientific Library, TP 1120.M499, p. 486, 488, 492, Jan. 1973. |