This is for Doug V:
Some of LOWRANCE patents:
1957 Introduced the world's first transistorized sonar instrument for sporting, fishing and boating
1959 Developed the technology to shoot high frequency sonar signals through the bottom of boat hulls
1960 Produced temperature-stable transducers, enabling fishermen to make soundings through ice
1960 Used backlighted faceplates for easy night-time viewing
1965 Conceived and developed effective interference suppression systems
1965 Produced the first sonars and transducers capable of high speed performance (from 15 to more than 65 miles per hour)
1969 Produced a high-resolution sonar instrument able to separate fish six inches off the bottom
1970 Patented an electronic speed control circuit for multi-depth range sonars
1970 Patented a method and apparatus for improving fishing under a dock
1971 Devised the first flasher-type sonar with a focused lens light-trap dial
1972 Patented time-varying gain control circuits
1972 Patented a display stand
1973 Patented the variable pulse length suppression system, effectively eliminating acoustical and electrical interference
1973 Patented a device for indicating the temperature and depth of water
1973 Patented a submerged object warning apparatus for ships
1973 Patented a trolling motor with steering means
1973 Patented a light shield for an indicating instrument
1973 Patented an apparatus for mounting a transducer to the transom of a boat
1973 Patented an inverter ballast circuit
1973 Patented an apparatus for providing an indication of the depth of objects in water
1974 Patented a sonar transducer
1974 Patented an oxygen analyzer
1974 Patented an improved trolling motor
1974 Patented a four phase stepping motor control
1974 Patented an automatic down rigger
1974 Patented a light emitting diode (LED) of phosphorous readout
1974 Patented a spring loaded transducer bracket
1976 Introduced the first fully interchangeable transducers
1976 Patented a sonar flasher speed control
1977 Patented a low cost gimbal mount sonar
1978 Patented a fully variable tracking suppression system for white-line or gray-line paper chart recorders
1978 Patented a method of manufacturing transducers
1979 Combined microprocessors (computers on a microchip) and independent keyboard entry in sonars
1980 Introduced a silent, lifetime brush for flashers
1980 Patented a brush holder for rectilinear recorder
1980 Patented a commutator and fiber brush rotating disc
1982 Designed a super-high resolution sonar able to separate vertical targets just one inch apart
1982 Patented a range expander for sonar
1983 Perfected a plastic through-the-hull transducer even stronger than its bronze counterpart
1983 Patented a sonar with signal amplitude differentiation and noise suppression
1984 Patented an improved gimbal mounting bracket
1984 Patented a transducer mounting
1985 Introduced the first LCG that combined a microprocessor with independent keyboard entry of upper and lower depth limits
1986 Patented a sonar with capability of transmitting and printing on alternate cycles
1987 Introduced "Clearvision" LCG display screens, with high contrast graphics and the widest viewing angle in the industry
1989 Patented a sonar fish finder with a split screen display which indicates whether fish or other objects are left, right, or under the boat
1990 Patented a 3D sonar transducer, and a method of mounting a transducer flush with the boat hull maximizing sonar performance with no effect on boat performance
1990 Patented a method of mounting a transducer in a boat hull
1992 Patented a sonar transducer with low drag, low acoustical noise pickup, and improved sonar echo reception through its unique ellipsoidal shape
1995 Introduced the world's first LCD product to offer integrated GPS, mapping and sonar capabilities, and patented a sonar system with an interactive display
1996 Patented a ratcheted transducer mount with a protective kick-up feature to prevent damage if it hits a floating object
1996 Introduced the industry's first 12 channel GPS receiver sold for under $200
1996 Introduced the first hand held aviation GPS with full mapping capability
1996 Patented a two-piece interlocking connector
1997 Patented a floating transducer accessory for bank and shore fishing
1997 Patented a method of optionally installing a transducer in a boat hull
1998 Introduced the industry's first hand-held mapping GPS shipped with a full detailed mapping CD-ROM enabling upload of user selectable maps into the unit
1998 Patented a buoyant transducer assembly
1999 Introduced the "MapCreate" CD-ROM which allows the user to choose from a highly detailed digitized database with features such as, U.S. Navigational Aids, Streams and other water bodies for the boater and angler; or U.S. Rural Roads, Railroads, State and Federal Highways for land-based applications. In addition, the user can create a customized map of the area they select to download into their Lowrance GPS mapping unit.
2001 Introduced the Sport Fishing "First" of silent, paperless digital recording/playback/storage of sonar graphs and GPS trip details in the LCX-15 and 16 series of products.
2002 Introduced the Grayscale Flasher feature in select sonar units. Introduced the iFINDER®, the first hand-held GPS to utilize standard off-the-shelf memory cards of up to 128MB and more