Number | Name | Date | Kind |
---|---|---|---|
1606571 | Heising | Nov 1926 | |
1730528 | Robbins | Feb 1929 | |
1829355 | Houghton | Jul 1931 | |
2141208 | Eaves | Mar 1938 | |
2234007 | Olson et al. | Mar 1941 | |
2439666 | Marquis | Apr 1948 | |
2490466 | Olson et al. | Dec 1949 | |
2655566 | Pittinger | May 1953 | |
2661412 | Dreyfus | Nov 1953 | |
2713396 | Tavares | Jul 1955 | |
2810021 | Brownscombe | Jan 1957 | |
2846520 | Brownscombe | Nov 1958 | |
3019849 | King | Jul 1962 | |
3684052 | Sotome | Aug 1972 | |
3700225 | Fader et al. | Oct 1972 | |
4008374 | Tiefenbrun | Feb 1977 | |
4239943 | Czerwinski | Dec 1980 | |
4327257 | Schwartz | Apr 1982 | |
4378935 | Brown et al. | Apr 1983 | |
4384174 | Suzuki et al. | May 1983 | |
4547631 | Nieuwendijk et al. | Oct 1985 | |
4607382 | Dijkstra et al. | Aug 1986 | |
4657229 | Thurow | Apr 1987 | |
4722516 | Gregg | Feb 1988 | |
4722517 | Dijkstra et al. | Feb 1988 | |
5123053 | House | Jun 1992 | |
5147986 | Cockrum et al. | Sep 1992 | |
5327504 | Hobelsberger | Jul 1994 | |
5346187 | Drescher | Sep 1994 |
Number | Date | Country |
---|---|---|
60-185494 | Sep 1985 | JPX |
Entry |
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"Improvement of Low-Frequency Response In Small Loudspeaker Systems by Means of the Stabilized Negative-Sspring Principle" The Journal of the Acoustical Society of America Dec. 22, 1970, vol. 49, No. 5 (Part 1) 1971 pp. 1362-1367. |