Number | Name | Date | Kind |
---|---|---|---|
2845878 | Gutridge | Aug 1958 | |
2846172 | Gutridge et al. | Aug 1958 | |
2864321 | Clejan | Dec 1958 | |
2903977 | Ulinski | Sep 1959 | |
3035801 | Mangels | May 1962 | |
3180282 | Gutridge et al. | Apr 1965 | |
3189307 | Peterson | Jun 1965 | |
3202390 | Sherrie et al. | Aug 1965 | |
3236194 | Vivian | Feb 1966 | |
3289987 | Candlin, Jr. et al. | Dec 1966 | |
3291074 | Remy et al. | Dec 1966 | |
3353505 | Rollins et al. | Nov 1967 | |
3358954 | Smith et al. | Dec 1967 | |
3486467 | Coulson | Dec 1969 | |
4718800 | Engle | Jan 1988 | |
5026229 | Matyas et al. | Jun 1991 |
Entry |
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"Piggy-Back"--Scientic Library Jun. 1958, U.S. Pat. Office. |