Patents
| # | US Patent No | Link to edit Content |
|---|---|---|
| 1951 | 10384620 | |
| 1952 | 10384834 | |
| 1953 | 10385067 | |
| 1954 | 10385587 | |
| 1955 | 10385625 | |
| 1956 | 10385645 | |
| 1957 | 10386151 | |
| 1958 | 10386257 | |
| 1959 | 10387087 | |
| 1960 | 10387140 | |
| 1961 | 10387270 | |
| 1962 | 10387996 | |
| 1963 | 10388143 | |
| 1964 | 10388568 | |
| 1965 | 10389396 | |
| 1966 | 10389399 | |
| 1967 | 10389568 | |
| 1968 | 10389624 | |
| 1969 | 10389625 | |
| 1970 | 10389642 | |
| 1971 | 10389944 | |
| 1972 | 10389978 | |
| 1973 | 10390175 | |
| 1974 | 10390400 | |
| 1975 | 10390656 | |
| 1976 | 10390989 | |
| 1977 | 10391094 | |
| 1978 | 10391202 | |
| 1979 | 10391344 | |
| 1980 | 10391989 | |
| 1981 | 10392199 | |
| 1982 | 10392278 | |
| 1983 | 10392406 | |
| 1984 | 10392662 | |
| 1985 | 10393034 | |
| 1986 | 10393461 | |
| 1987 | 10394257 | |
| 1988 | 10394268 | |
| 1989 | 10394300 | |
| 1990 | 10394866 | |
| 1991 | 10394905 | |
| 1992 | 10395434 | |
| 1993 | 10395525 | |
| 1994 | 10395657 | |
| 1995 | 10396592 | |
| 1996 | 10397100 | |
| 1997 | 10397101 | |
| 1998 | 10397150 | |
| 1999 | 10397460 | |
| 2000 | 10397639 |