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US 4,950,542 AGranted
Articles having aroma
OwnerRobert S. Barkerinventor
Life of this patent
Estimating the term…
Abstract
Articles are coated to provide a sustained release of aroma with a composition of a homogeneous emulsion of polyurethane and essential oils.
Claims4
A method of forming a coating composition for the sustained release of an essential oil fragrance, which comprises the steps of admixing 3 to 20 parts by weight of an essential oil and 97 to 80 parts by weight of an aqueous polyurethane latex;
- and mechanically agitating the admixture until a clear homogeneous colloidal dispersion is formed having a particle size between 0.1 and 1.0 micron and thereafter forming said dispersion into a clear cohesive film capable of sustained release of the essential oil fragrance.
Dependencies are inferred from the claim text.