Patents
| # | US Patent No | Link to edit Content |
|---|---|---|
| 1951 | 10368948 | |
| 1952 | 10368953 | |
| 1953 | 10368988 | |
| 1954 | 10369109 | |
| 1955 | 10369224 | |
| 1956 | 10369480 | |
| 1957 | 10370099 | |
| 1958 | 10370863 | |
| 1959 | 10371348 | |
| 1960 | 10371806 | |
| 1961 | 10372197 | |
| 1962 | 10372223 | |
| 1963 | 10372793 | |
| 1964 | 10373773 | |
| 1965 | 10373974 | |
| 1966 | 10373987 | |
| 1967 | 10374529 | |
| 1968 | 10374803 | |
| 1969 | 10374938 | |
| 1970 | 10375215 | |
| 1971 | 10375222 | |
| 1972 | 10375249 | |
| 1973 | 10375341 | |
| 1974 | 10375373 | |
| 1975 | 10375444 | |
| 1976 | 10376030 | |
| 1977 | 10376190 | |
| 1978 | 10376191 | |
| 1979 | 10376259 | |
| 1980 | 10376356 | |
| 1981 | 10376386 | |
| 1982 | 10376487 | |
| 1983 | 10376505 | |
| 1984 | 10376584 | |
| 1985 | 10376652 | |
| 1986 | 10376912 | |
| 1987 | 10378193 | |
| 1988 | 10378216 | |
| 1989 | 10378218 | |
| 1990 | 10378229 | |
| 1991 | 10378239 | |
| 1992 | 10378518 | |
| 1993 | 10378700 | |
| 1994 | 10378707 | |
| 1995 | 10379301 | |
| 1996 | 10379539 | |
| 1997 | 10379925 | |
| 1998 | 10380202 | |
| 1999 | 10380576 | |
| 2000 | 10380609 |