Patents Assigned to International Octrooimaatschappij "Octropa" BV
  • Color change perfume systems
    Patent number: 4128508
    Abstract: This invention provides a color change perfume system in which color is caused to change when the perfume in the system is effectively exhausted to the atmosphere. The invention also provides air fresheners and the like consisting of a porous carrier impregnated with the perfumed color change system.
    Type: Grant
    Filed: June 22, 1977
    Date of Patent: December 5, 1978
    Assignee: International Octrooimaatschappij "Octropa" BV
    Inventor: David R. Munden