WO1990009813A1 - A scented air freshening device and method for making the same - Google Patents

A scented air freshening device and method for making the same Download PDF

Info

Publication number
WO1990009813A1
WO1990009813A1 PCT/US1990/001087 US9001087W WO9009813A1 WO 1990009813 A1 WO1990009813 A1 WO 1990009813A1 US 9001087 W US9001087 W US 9001087W WO 9009813 A1 WO9009813 A1 WO 9009813A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
air freshening
fragrant
solvent
freshening device
Prior art date
Application number
PCT/US1990/001087
Other languages
French (fr)
Inventor
Douglas M. Vick
James T. Baxter
Original Assignee
New Ideas International, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by New Ideas International, Inc. filed Critical New Ideas International, Inc.
Publication of WO1990009813A1 publication Critical patent/WO1990009813A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/015—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone
    • A61L9/04—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air without heating
    • A61L9/042—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air without heating with the help of a macromolecular compound as a carrier or diluent
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/015—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone
    • A61L9/04—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air without heating
    • A61L9/12—Apparatus, e.g. holders, therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/50—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by odorisation

Definitions

  • the present invention relates to an air freshening device. More particularly, the invention relates to an air filter having a fragrant polymeric residue on its filtering material or other portion through which air may pass and which may be used in a mechanical forced air type ventilation system.
  • compositions and devices for releasing a fragrance over a long period of time are known.
  • U.S. Patent No. 4,118,226 discloses placing a solid aromatic medium in a perforated case which in turn is placed in an air circulation system.
  • U.S. Patent No. 4,118,226 discloses placing a solid aromatic medium in a perforated case which in turn is placed in an air circulation system.
  • U.S. Patent No. 4,118,226 discloses placing a solid aromatic medium in a perforated case which in turn is placed in an air circulation system.
  • U.S. Patent No. 4,604,114 similarly discloses placing large solid rods of fragrant scented material in an air circulation system.
  • U.S. Patent No. 4,563,333 discloses a deodorizing fitting for an air filter in which a rectangular envelope of perforated cardboard with a deodorizing insert therein is adhered to the corner of the filter.
  • U.S. Patent No. 4,065,262 discloses utilizing a plurality of containers for holding an air freshening composition positioned in the air filter.
  • U.S. Patent No. 4,523,870 relates to an aroma dispensing cartridge placed in front of a air vent. A problem exists, however, in that each of these patents disclose devices which interfere with the flow of air through the circulation system.
  • the present invention relates to an air freshening device, such as an air filter, having a residue of polymer and fragrant liquid on a portion of the device through which the air passes.
  • the device may be an air filter, preferably having filtering material such as fibers or foam rubber.
  • the residue may be placed on the filtering material itself, or on a perforated substrate, such as a mesh, placed adjacent the material.
  • a solution is prepared by dissolving a fragrant liquid in a volatile solvent.
  • the solution is then mixed with a polymeric material and allowed to form a gel which is then applied to the portion of the air filter through which air passes.
  • the solvent is evaporated and a fragrant, solid residue is deposited on the filtering material or mesh.
  • the filtering material may comprise a standard force-air filter or the material may be placed in a standard filter frame or other stabilizing means for use in an air circulation system, such as a heating or air conditioning system. Air circulating through the system passes unobstructed through the filter and becomes scented with the fragrance. Because the fragrance is placed directly on the material, the present invention may be employed with little or no structural modifications to either the air circulation system or the filters.
  • an object of the present invention to provide an air freshening device which may be utilized in a pre-existing air circulation system and which does not interfere with the flow of air through the system.
  • Figure 1 is a top plan view of an air freshening device constructed according to the present invention.
  • FIG. 1 illustrates a conventional air filter 10 of the kind typically provided in a receiving slot in an air circulation system.
  • the filter 10 is comprised of fibrous filtering material 12, such as a textile material or other woven fibers that arrest particles in the interstices until they are clogged, and a rigid or semi ⁇ rigid frame 14 about the periphery of the material 12 for holding the filtering material 12 in position.
  • a mesh 16 for further maintaining the filtering material 12 within the frame 14 is also provided.
  • the fibers 18 of the filtering material 12 contain thereon a residue of a fragrant liquid and a polymer.
  • a polymeric material-1 is dissolved in a volatile solvent.
  • a fragrant liquid is then added to the polymer/solvent with vigorous stirring, and the resulting mixture is allowed to stand until a gel results.
  • the viscosity of the gel can be regulated by adding solvent or polymer.
  • the gel is then applied to the fibers 18 and allowed to dry. Upon drying, a solid, fragrant residue is deposited upon the fibers 18 and as air passes through the filter 10, the fragrance imparts a pleasant odor to the circulating air.
  • Any dissolvable fragrance material may be used, including methyl salicylate and citronella. It is preferable that a fragrant liquid be used. Likewise, any polymer may be used so long as it dissolves in the solvent and can act as a carrier for the fragrance. However, a non-ionic, water soluble polymer, such as hydroxypropylcellulose, is preferred. It has been found that a ratio of approximately 3:2 fragrant liquid to polymer (by weight) is preferred, although the ratio may range from 1:1 to 4:1 fragrant liquid to polymer (by weight) , respectively. By varying the ratio of fragrant liquid to polymer, residue with light, medium or heavy scents may be produced.
  • the solvent is preferably non-flammable and non- toxic. Furthermore, it should have a low boiling point so that it is volatile and evaporates rapidly. Methylene chloride has been found to be a particularly suitable solvent.
  • a fixative such as benzyl benzoate, Hercolyn D a product of John H. Calo of Valley Stream, New York may be added to the solution or gel to slow down the evaporation of the fragrance. Also, a dye may be added to give color to the residue.
  • the gel may be applied to the fibers 18 in virtually any manner so long as a residue is formed on the final product.
  • the gel when having a high viscosity, may be poured directly onto the fibers 18 in a lattice design or the filter 10 may be dipped into the gel.
  • a gel of lower viscosity may be used to treat the individual fibers 18 of the filtering material 12 before they are packed into the frame 14.
  • citronella oil 30 ml was dissolved in 125 ml of methylene chloride. 20 g s of hydroxypropylcellulose was then added to the solution with stirring. The mixture was placed in a sealed flask and left to sit for 8 hours at room temperature. The resulting product was a gel, which was then applied to a porous piece of 1/4 inch thick filter-grade foam rubber. After approximately 3 hours at room temperature, the solvent had evaporated from the gel and a solid residue remained on the foam rubber. It was found that the residue caused minimum change in the velocity of air passing through the foam rubber.
  • the device of the present invention may be placed over the air path in a standard air circulation system.
  • the device may be a part of a complicated filtering system, or may simply consist of a single sheet of residue- containing foam rubber capable of being attached over an air stream with tape or other standard fastening means.
  • the fragrance imparts a pleasant odor to the surrounding air.
  • the device such as a filter, has lost its fragrance, it may simply be replaced in the same manner as a standard filter. Therefore, an added benefit of the present invention is that the user is reminded to change his air filter once the fragrance is lost.
  • the term "through which air passes” is defined to include air circulating adjacent a surface upon which the residue is deposited.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)

Abstract

A method of producing an air freshening device (10) having the steps of dissolving a fragrant material in a volatile solvent, mixing the solvent and dissolvent fragrant material with a polymeric material to form a mixture, applying the mixture to a portion of the device through which air may pass (12), and allowing the solvent to evaporate to leave a fragrant residue on the portion of the air filter.

Description

A SCENTED AIR FRESHENING DEVICE
AND METHOD FOR MAKING THE SAME
TECHNICAL FIELD
The present invention relates to an air freshening device. More particularly, the invention relates to an air filter having a fragrant polymeric residue on its filtering material or other portion through which air may pass and which may be used in a mechanical forced air type ventilation system.
BACKGROUND ART
Compositions and devices for releasing a fragrance over a long period of time are known. For example, U.S. Patent No. 4,118,226 discloses placing a solid aromatic medium in a perforated case which in turn is placed in an air circulation system. U.S. Patent
No. 4,604,114 similarly discloses placing large solid rods of fragrant scented material in an air circulation system. U.S. Patent No. 4,563,333 discloses a deodorizing fitting for an air filter in which a rectangular envelope of perforated cardboard with a deodorizing insert therein is adhered to the corner of the filter. U.S. Patent No. 4,065,262 discloses utilizing a plurality of containers for holding an air freshening composition positioned in the air filter. U.S. Patent No. 4,523,870 relates to an aroma dispensing cartridge placed in front of a air vent. A problem exists, however, in that each of these patents disclose devices which interfere with the flow of air through the circulation system. Furthermore, none of the inventions in these patents can be employed in a pre- existing filter system. Rather, specifically designed frames or casings must be employed to hold the fragrant structures. There exists a need, therefore, for an air freshening device which may be used in a pre-existing air circulation system and which does not interfere with the circulation of air through that system.
DISCLOSURE OF THE INVENTION
The present invention relates to an air freshening device, such as an air filter, having a residue of polymer and fragrant liquid on a portion of the device through which the air passes. The device may be an air filter, preferably having filtering material such as fibers or foam rubber. The residue may be placed on the filtering material itself, or on a perforated substrate, such as a mesh, placed adjacent the material.
To provide the residue-containing material, a solution is prepared by dissolving a fragrant liquid in a volatile solvent. The solution is then mixed with a polymeric material and allowed to form a gel which is then applied to the portion of the air filter through which air passes. The solvent is evaporated and a fragrant, solid residue is deposited on the filtering material or mesh. The filtering material may comprise a standard force-air filter or the material may be placed in a standard filter frame or other stabilizing means for use in an air circulation system, such as a heating or air conditioning system. Air circulating through the system passes unobstructed through the filter and becomes scented with the fragrance. Because the fragrance is placed directly on the material, the present invention may be employed with little or no structural modifications to either the air circulation system or the filters.
Therefore, it is an object of the present invention to provide an air freshening device which may be utilized in a pre-existing air circulation system and which does not interfere with the flow of air through the system.
BRIEF DESCRIPTION OF THE DRAWING
Figure 1 is a top plan view of an air freshening device constructed according to the present invention.
BEST MODE OF CARRYING OUT THE INVENTION
FIG. 1 illustrates a conventional air filter 10 of the kind typically provided in a receiving slot in an air circulation system. The filter 10 is comprised of fibrous filtering material 12, such as a textile material or other woven fibers that arrest particles in the interstices until they are clogged, and a rigid or semi¬ rigid frame 14 about the periphery of the material 12 for holding the filtering material 12 in position. A mesh 16 for further maintaining the filtering material 12 within the frame 14 is also provided.
The fibers 18 of the filtering material 12 contain thereon a residue of a fragrant liquid and a polymer. To produce the residue-containing fibers 18, a polymeric material-1 is dissolved in a volatile solvent. A fragrant liquid is then added to the polymer/solvent with vigorous stirring, and the resulting mixture is allowed to stand until a gel results. The viscosity of the gel can be regulated by adding solvent or polymer. The gel is then applied to the fibers 18 and allowed to dry. Upon drying, a solid, fragrant residue is deposited upon the fibers 18 and as air passes through the filter 10, the fragrance imparts a pleasant odor to the circulating air.
Any dissolvable fragrance material may be used, including methyl salicylate and citronella. It is preferable that a fragrant liquid be used. Likewise, any polymer may be used so long as it dissolves in the solvent and can act as a carrier for the fragrance. However, a non-ionic, water soluble polymer, such as hydroxypropylcellulose, is preferred. It has been found that a ratio of approximately 3:2 fragrant liquid to polymer (by weight) is preferred, although the ratio may range from 1:1 to 4:1 fragrant liquid to polymer (by weight) , respectively. By varying the ratio of fragrant liquid to polymer, residue with light, medium or heavy scents may be produced.
The solvent is preferably non-flammable and non- toxic. Furthermore, it should have a low boiling point so that it is volatile and evaporates rapidly. Methylene chloride has been found to be a particularly suitable solvent. A fixative, such as benzyl benzoate, Hercolyn D a product of John H. Calo of Valley Stream, New York may be added to the solution or gel to slow down the evaporation of the fragrance. Also, a dye may be added to give color to the residue.
The gel may be applied to the fibers 18 in virtually any manner so long as a residue is formed on the final product. For example, the gel, when having a high viscosity, may be poured directly onto the fibers 18 in a lattice design or the filter 10 may be dipped into the gel. Alternatively, a gel of lower viscosity may be used to treat the individual fibers 18 of the filtering material 12 before they are packed into the frame 14.
The following is one illustrative example of the method of producing the scented air freshening device of the present invention: EXAMPLE I
30 ml of citronella oil was dissolved in 125 ml of methylene chloride. 20 g s of hydroxypropylcellulose was then added to the solution with stirring. The mixture was placed in a sealed flask and left to sit for 8 hours at room temperature. The resulting product was a gel, which was then applied to a porous piece of 1/4 inch thick filter-grade foam rubber. After approximately 3 hours at room temperature, the solvent had evaporated from the gel and a solid residue remained on the foam rubber. It was found that the residue caused minimum change in the velocity of air passing through the foam rubber.
In use, the device of the present invention may be placed over the air path in a standard air circulation system. The device may be a part of a complicated filtering system, or may simply consist of a single sheet of residue- containing foam rubber capable of being attached over an air stream with tape or other standard fastening means. In either embodiment, as air passes freely through the device, the fragrance imparts a pleasant odor to the surrounding air. Once the device, such as a filter, has lost its fragrance, it may simply be replaced in the same manner as a standard filter. Therefore, an added benefit of the present invention is that the user is reminded to change his air filter once the fragrance is lost.
The foregoing is considered as illustrative only of the principles of the invention, and alternative embodiments of the invention are also envisioned. For example, rather than applying the residue to the filtering material 12, it is certainly possible, and in some instances preferred, to apply the residue to a mesh or grill, such as the filter maintaining mesh 16, which can be placed in the path of circulating air. Overall, because the residue is deposited in a thin layer, it may be provided on virtually any portion of an air filter 10 through which air passes and still assure minimum velocity reduction of the air and maximum fragrance absorption.
As used herein, the term "through which air passes" is defined to include air circulating adjacent a surface upon which the residue is deposited.

Claims

WHAT IS CLAIMED IS:
1. A method of producing an air freshening device, comprising the steps of: (a) forming a mixture of volatile solvent, a fragrant material and a polymeric material;
(b) applying said mixture to a portion of said device through which air may pass; and
(c) allowing said solvent to evaporate to leave a fragrant residue on said portion of said device.
2. The method of Claim 1, wherein said portion of said device is fibrous filter material.
3. The method of Claim 1, wherein said portion of said device is a mesh material.
4. The method of Claim 1, wherein said portion of said device is foam rubber.
5. The method of Claim 1, wherein said fragrant material is a liquid.
6. The method of Claim 1, wherein said fragrant material is methyl salicylate.
7. The method of Claim 1, wherein said fragrant material is citronella.
8. The method of Claim 1, wherein said polymer is a water soluble, non-ionic polymer.
9. The method of Claim 1, wherein said polymer is hydroxypropylcellulose.
10. The method of Claim 1, wherein said solvent is non-toxic and non-flammable.
11. The method of Claim 1, wherein said solvent is methylene chloride.
12. The method of Claim 1, wherein the ratio of said fragrant material to said solvent ranges from approximately 1:1 to 4:1 by weight.
13. The method of Claim 1, wherein the ratio of said fragrant material to said solvent is approximately 3:2 by weight.
14. The method of Claim 1, and further comprising the step of adding an effective amount of fixative to said mixture.
15. An air freshening device, comprising a residue of effective amounts of a fragrant material and polymeric material provided on a portion of said device through which air passes.
16. An air freshening device of Claim 15, wherein said portion of said device is fibrous filter material.
17. An air freshening device of Claim 15, wherein said portion of said device is mesh material.
18. An air freshening device of Claim 15, wherein said portion of said device is foam rubber.
19. An air freshening device of Claim 15, wherein said fragrant material is a liquid.
20. An air freshening device of Claim 15, wherein said fragrant material is methyl salicylate.
21. An air freshening device of Claim 15, wherein said fragrant material is citronella.
22. An air freshening device of Claim 15, wherein said polymer is a water soluble, non-ionic polymer.
23. An air freshening device of Claim 15, wherein said polymer is hydroxypropylcellulose.
24. An air freshening device of Claim 15, wherein said residue comprises an effective amount of as a fixative.
PCT/US1990/001087 1989-03-02 1990-03-01 A scented air freshening device and method for making the same WO1990009813A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US31812189A 1989-03-02 1989-03-02
US318,121 1989-03-02

Publications (1)

Publication Number Publication Date
WO1990009813A1 true WO1990009813A1 (en) 1990-09-07

Family

ID=23236747

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1990/001087 WO1990009813A1 (en) 1989-03-02 1990-03-01 A scented air freshening device and method for making the same

Country Status (3)

Country Link
AU (1) AU5274890A (en)
CA (1) CA2032142A1 (en)
WO (1) WO1990009813A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2807973A1 (en) * 2000-04-21 2001-10-26 Filtrauto VEHICLE INTERIOR AIR FILTER, VEHICLE COMPRISING SUCH A FILTER, AND MANUFACTURING METHOD
EP2695563A3 (en) * 2012-08-08 2015-12-09 Bissell Homecare, Inc. Solid fragrance carrier and method of use in a vacuum cleaner

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4118226A (en) * 1977-03-22 1978-10-03 Richard Lawrence Bourassa Combination air filter and air treating device
US4425321A (en) * 1977-07-29 1984-01-10 L'oreal Deodorant compositions containing a polycarboxylic acid salt
US4735358A (en) * 1986-03-04 1988-04-05 Daiken Iko Kabushiki Kaisha Method and apparatus of vaporizing active substances

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4118226A (en) * 1977-03-22 1978-10-03 Richard Lawrence Bourassa Combination air filter and air treating device
US4425321A (en) * 1977-07-29 1984-01-10 L'oreal Deodorant compositions containing a polycarboxylic acid salt
US4735358A (en) * 1986-03-04 1988-04-05 Daiken Iko Kabushiki Kaisha Method and apparatus of vaporizing active substances

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2807973A1 (en) * 2000-04-21 2001-10-26 Filtrauto VEHICLE INTERIOR AIR FILTER, VEHICLE COMPRISING SUCH A FILTER, AND MANUFACTURING METHOD
US6524375B2 (en) 2000-04-21 2003-02-25 Filtrauto Vehicle cabin air filter, a vehicle including such a filter, and a method of manufacture
EP2695563A3 (en) * 2012-08-08 2015-12-09 Bissell Homecare, Inc. Solid fragrance carrier and method of use in a vacuum cleaner
CN107252275A (en) * 2012-08-08 2017-10-17 碧洁家庭护理有限公司 Filter bag
US10238253B2 (en) 2012-08-08 2019-03-26 Bissell Homecare, Inc. Solid fragrance carrier and method of use in a vacuum cleaner
US10702109B2 (en) 2012-08-08 2020-07-07 Bissell Inc. Solid fragrance carrier and method of use in a vacuum cleaner

Also Published As

Publication number Publication date
CA2032142A1 (en) 1990-09-03
AU5274890A (en) 1990-09-26

Similar Documents

Publication Publication Date Title
DE69917309T2 (en) GELIFIED VAPOR EQUIPMENT
US4753389A (en) System and method for controlled release of vapors
US5861128A (en) Scented air freshening device
US6929681B2 (en) Air scenting compositions and processes for use thereof in air scenting devices
US5698166A (en) Scented air freshening device and method of making same
US6749672B2 (en) Scenting device for air flow apparatus
USRE32513E (en) Method for dispensing at a visibly detectable rate, continuously or discontinuously, for discrete periods of time at a steady rate, a volatile composition of matter from a container into the atmosphere as well as the container used in the method
JP2003526476A (en) Aromatic hydrogel air freshener kit
EP0309549A1 (en) Membrane-gel diffusion device
US20060110297A1 (en) Vehicle cabin air filter freshener
EP1551465A1 (en) A device for dispensing active volatile liquid
EP0996407B1 (en) Adhesive plaster with microcapsules containing essences, and method for its preparation
US20180140736A1 (en) Ornamental air fragrance dispenser
WO2005118007A1 (en) Volatile composition impregnated in a porous carrier and comprising a dye as “end-of-life” indicator
WO1990009813A1 (en) A scented air freshening device and method for making the same
CA2070936C (en) A scented air freshening device and method for making the same
JPH0487967A (en) Fragrance giving method for tissue paper
JPS61135667A (en) Deodorant
JPH08207561A (en) Aromatic, deodorant and shade net
JPS58185513A (en) Aromatic for bath
JP2516352Y2 (en) Air freshener container
JPS59186912A (en) Perfume-containing soluble film
JPH0136379B2 (en)
JPH11209742A (en) Volatile oily material-maintaining material and term displaying material
JPH0117377B2 (en)

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AT AU BB BG BR CA CH DE DK ES FI GB HU JP KP KR LK LU MC MG MW NL NO RO SD SE SU

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE BF BJ CF CG CH CM DE DK ES FR GA GB IT LU ML MR NL SE SN TD TG

WWE Wipo information: entry into national phase

Ref document number: 2032142

Country of ref document: CA

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642