Description

United Kingdom Patent No. 1507177 for Method of and Apparatus for Sonar Signal Texture Enhancement, dated 4/14/1975 (2 copies); Patent No. 3,975,704 for Method of and Apparatus for Sonar and Related Signal Texture Enhancement of Recording Media, dated 8/17/1976 (2 copies); Canadian Patent No. 1010985 for Method of and Apparatus for Sonar and Related Signal Texture Enhancement on Recording Media, dated 5/24/1977; Letter to M. Klein from Robert Rines, dated 1/9/1978 with Patent No. 4,055,138 for Underwater Vehicle Towing and Recovery Apparatus, dated 10/25/1977 (3 copies); Patent No. 4,137,538 for Process and Apparatus for Compatible Wet and Dry Paper Signal Recording, dated 1/30/1979 (3 copies); Patent No. 4,202,050 for Multi-Angular Sector Sound Transmitting and Receiving System, dated 5/6/1980 (3 copies); Patent No. 4,422,166 for Undersea Sonar Scanner Correlated with Auxiliary Sensor Trace, dated 12/20/1983 (2 copies); Status of Patents and Trademarks 11/20/1989; Letter to M. Klein from Chris, dated 6/11/1992