Macedo; Pedro B.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4902426 Ion exchange compositionsExpiredMay 20, 88Feb 20, 90[B01D]
4876232 Supported heteropolycyclic compounds in the separation and removal of late transition metalsExpiredSep 28, 87Oct 24, 89[B01J, C01G, C02F]
4737316 Purification of contaminated liquidExpiredMay 20, 86Apr 12, 88[G21F]
4544499 Fixation by anion exchange of toxic materials in a glass matrixExpiredJun 07, 82Oct 01, 85[G21F]
4528011 Immobilization of radwastes in glass containers and products formed therebyExpiredDec 14, 81Jul 09, 85[C01C]
4469628 Fixation by ion exchange of toxic materials in a glass matrixExpiredApr 21, 82Sep 04, 84[C09K]
4443700 Optical sensing apparatus and methodExpiredMay 13, 82Apr 17, 84[G02B]
4362659 Fixation of radioactive materials in a glass matrixExpiredSep 17, 79Dec 07, 82[G21F]
4362542 Method of producing a strong optical fiberExpiredNov 02, 81Dec 07, 82[C03C, C03B]
4342907 Optical sensing apparatus and methodExpiredFeb 01, 80Aug 03, 82[G02B]
4312774 Immobilization of radwastes in glass containers and products formed therebyExpiredApr 30, 79Jan 26, 82[G21F]
4224177 Fixation of radioactive materials in a glass matrixExpiredMar 09, 78Sep 23, 80[G21F]

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