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Richard P. Gunawardane

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  • Kandy, LK
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Patents Grantslast 30 patents

  • Information Patent Grant

    Fertilizer material from apatite
    • Patent number 4,436,546
    • Issue date Mar 13, 1984
    • National Research Development Corporation
    • Fredrik P. Glasser
    • C05 - FERTILISERS MANUFACTURE THEREOF
  • Information Patent Grant

    Fertilizer material from apatite
    • Patent number 4,363,650
    • Issue date Dec 14, 1982
    • National Research Development Corporation
    • Fredrik P. Glasser
    • C05 - FERTILISERS MANUFACTURE THEREOF