Patents
| # | US Patent No | Link to edit Content |
|---|---|---|
| 1951 | 10419374 | |
| 1952 | 10419805 | |
| 1953 | 10419813 | |
| 1954 | 10419817 | |
| 1955 | 10419910 | |
| 1956 | 10419996 | |
| 1957 | 10420374 | |
| 1958 | 10420431 | |
| 1959 | 10420703 | |
| 1960 | 10420705 | |
| 1961 | 10420735 | |
| 1962 | 10420760 | |
| 1963 | 10420883 | |
| 1964 | 10421133 | |
| 1965 | 10421580 | |
| 1966 | 10421936 | |
| 1967 | 10423034 | |
| 1968 | 10423658 | |
| 1969 | 10423709 | |
| 1970 | 10423885 | |
| 1971 | 10424786 | |
| 1972 | 10424941 | |
| 1973 | 10425612 | |
| 1974 | 10425697 | |
| 1975 | 10425703 | |
| 1976 | 10425806 | |
| 1977 | 10425817 | |
| 1978 | 10426003 | |
| 1979 | 10426219 | |
| 1980 | 10426269 | |
| 1981 | 10426275 | |
| 1982 | 10426399 | |
| 1983 | 10426513 | |
| 1984 | 10426539 | |
| 1985 | 10426549 | |
| 1986 | 10426583 | |
| 1987 | 10426633 | |
| 1988 | 10426780 | |
| 1989 | 10426787 | |
| 1990 | 10426980 | |
| 1991 | 10427011 | |
| 1992 | 10427061 | |
| 1993 | 10427443 | |
| 1994 | 10427619 | |
| 1995 | 10427816 | |
| 1996 | 10428380 | |
| 1997 | 10428949 | |
| 1998 | 10429041 | |
| 1999 | 10429161 | |
| 2000 | 10429288 |