American National Watermattress Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4864670 Water mattress with vertically oriented hydraulic chambersExpiredMay 19, 88Sep 12, 89[A47C]
4799277 Hybrid watermattress having concave softsidesExpiredMar 21, 88Jan 24, 89[A47C]
4794658 Mattress cover having colored backingExpiredFeb 17, 87Jan 03, 89[A47C]
4757564 Mattress having cover with memory fabricExpiredAug 25, 86Jul 19, 88[A47C]
4753696 Method of making a water mattress with hydraulic chamber assemblyExpiredMar 12, 87Jun 28, 88[B32B]
4751756 Water mattress with hydraulic chamber assembly and method of making sameExpiredMar 12, 87Jun 21, 88[A47C]

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