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United States Utility Patents
5,293,440 - 5,293,449

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NumberTitle
5,293,440 Environmentally stable fiber optic polarization maintaining couplers
5,293,441 Optical device capable of reliably fixing a substrate to a package
5,293,442 Crush-resistant high-strength buffered optical waveguide fiber cable
5,293,443 Cable utilizing multiple light waveguide stacks
5,293,444 Wavelength converter
5,293,445 AGC with non-linear gain for PLL circuits
5,293,446 Two stage thermostatically controlled electric water heating tank
5,293,447 Photovoltaic solar water heating system
5,293,448 Speech analysis-synthesis method and apparatus therefor
5,293,449 Analysis-by-synthesis 2,4 kbps linear predictive speech codec



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