TREA

Helena Maria B. Alves dos Santos

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  • Lisbon, PT
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Patents Grantslast 30 patents

  • Information Patent Grant

    Inertia pen
    • Patent number 4,461,590
    • Issue date Jul 24, 1984
    • Antonio M. Alves dos Santos
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Inertia pen with slidable sleeve
    • Patent number 4,315,695
    • Issue date Feb 16, 1982
    • Antonio M. Alves dos Santos
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES