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Founded: 1971 by David Blackmer
Sold to BSR in 1979
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*
U.S. Patent No. 3,714,462, 01/30/1973: Multiplier Circuits Blackmer, David E. [ abstract ] [ DjVu 82 KB ]
U.S. Patent No. 4,234,804, 11/18/1980: Signal correction for electrical gain control systems Bergstrom, Gary (assignee dbx, Inc.) [ abstract ] [ DjVu 198 KB ]
U.S. Patent No. 4,331,931, 05/25/1982: Gain control systems Adams, Robert W. (assignee dbx, Inc.) [ abstract ]
[ DjVu 126 KB ]
U.S. Patent No. 4,403,199
, 09/06/1983: Gain control systems Blackmer, David E. (assignee dbx, Inc.) [ abstract ]
[ DjVu 179 KB ]
U.S. Patent No. 4,454,433
, 06/12/1984: Multiplier circuit Welland, David R. (assignee dbx, Inc.) [ abstract ]
[ DjVu 100 KB ]
Unprocessed Patents
4,101,849 Blackmer & Jaeger Adaptive filter
4,112,254 Blackmer Signal compander system
4,124,784 Johnson, Blackmer & Mosely Motion picture sound system
4,136,314 Blackmer & Jaeger Adaptive signal weighting system
4,177,356 Jaeger & Blakely Signal enhancement system
4,182,930 Blackmer Detection and monitoring device
4,182,993 Tyler Signal amplitude compression system
4,220,929 Talbot & Blackmer Signal expander
4,316,060 Adams & Tyler Equalizing system
4,316,107 Talbot Multiplier circuit
4,329,598 Welland Bias generator
4,368,425 Adams System for and method of testing transistors
4,377,792 Blackmer & Welland Compander system
4,409,500 Welland Operational rectifier and bias generator
4,425,551 Blackmer & Welland Differential amplifier stage having bias compensating means
4,430,626 Adams Networks for the log domain
4,434,380 Welland Compensation for VCA OP amp errors
4,445,053 Jaeger & Seale Square law charger
4,467,287 Aylward Signal expander
4,471,324 Welland All NPN variably controlled amplifier
4,473,793 Blackmer & Welland Bias generator
4,503,553 Davis Loudspeaker system
4,503,554 Davis Stereophonic balance control system
4,539,526 Davis Adaptive signal weighting system
4,588,979 Adams Analog-to-digital converter
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