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<p>This 2011 patent for a composition for disposing of unused medicines seems broad enough to cover many of the home disposal products on the market.
<a href="https://www.google.com/patents/US7918776">https://www.google.com/patents/US7918776</a></p>
<p>I have no idea if any are paying the patent holder, if they are infringing on it, or if one of them bought the patent from Sherry Day, the inventor.</p>
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<p><font size="+0"><span lang="en-US"><font size="2">Ed Gottlieb<br>
Chair, Coalition for Safe Medication Disposal<br>
Board Member, New York Product Stewardship Council<br>
</font><font size="2">Industrial Pretreatment Coordinator</font></p>
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<div><font size="2">Ithaca Area Wastewater Treatment Facility</font><br>
<font size="2">525 3</font><sup>rd</sup><font size="2"> Street</font></div>
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<div><font size="2">Ithaca, NY 14850</font></div>
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<div><font size="2">(607) 273-8381</font></div>
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<div><font size="2">fax: (607) 273-8433</font></div>
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