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Patent
Info There have been several prior attempts to address this consumer protection concern without any commercially satisfactory results. The following links are several examples: • Granofsky, U.S. Patent No. 5,108,003 • Hammond, U.S. Patent No. 5,014,869 • Howard, U.S. Patent No. 4,927,048 • Cho, U.S Patent No. 5,813,561 • Eberhart, U.S. Patent No. 4,749,100 The foregoing references are typical of current clean-top technology applications and have proven to be either impractical or cost prohibitive
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