US4735626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air freshener unit
Assignee: PARVAIR Ltd
•
Filing: 1987-07-06
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Granted: 1988-04-05
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Expires: 2007-07-06
Abstract
Abstract New dynamic air freshener unit comprises a porous synthetic polymer support impregnated with a fragrance. The synthetic polymer support is one produced by: (a) bonding together small particles of solid polymer; (b) coagulating polymer solutions in a non-solvent for the polymer; or (c) expanding a thermoplastic or thermosetting plastic by means of a blowing agent; to form a porous body. The unit is especially useful in vacuum cleaners.
Inventors
- 👤 Brian R. Smith
- 👤 Arthur W. R. Balkham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:50
CPC Classifications
A; A61; A61L; A61L9/00; A61L9/015; A61L9/04; A61L9/12; A61L9/122; A61L9/042; Y; Y10; Y10S; Y10S521/00; Y10S521/918; Y10S521/919
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
81 words
A vacuum cleaner having a dust bag, said dust bag having inserted therein a dynamic air freshener unit comprising a shaped porous synthetic polymer support impregnated with a fragrance, wherein the synthetic polymer support is produced by bonding together small particles of solid polymer or coagulating a polymer solution in a non-solvent for the polymer, such that said unit will release fragrance by the passage of air over it caused by the application of differential air pressure by said vacuum cleaner.
Claim 2
Dependent Claim
81 words
A vacuum cleaner having a dust bag, said dust bag having inserted therein a dynamic air freshener unit comprising a shaped porous synthetic polymer support impregnated with a fragrance, wherein the synthetic polymer support is produced by bonding together small particles of solid polymer or coagulating a polymer solution in a non-solvent for the polymer, such that said unit will release fragrance by the passage of air over it caused by the application of differential air pressure by said vacuum cleaner.
Claim 3
Independent Claim
98 words
A method of imparting a fragrance to a room comprising inserting within a dust bag of a vacuum cleaner a dynamic air freshener unit comprising a shaped porous synthetic polymer support impregnated with a fragrance, wherein the synthetic polymer support is produced by bonding together small particles of solid polymer or coagulating a polymer solution in a non-solvent for the polymer, and vacuuming said room with the vacuum cleaner, such that said unit will release fragrance to said room by the passage of air over it caused by the application of differential air pressure by said vacuum cleaner.
Claim 4
Independent Claim
98 words
A method of imparting a fragrance to a room comprising inserting within a dust bag of a vacuum cleaner a dynamic air freshener unit comprising a shaped porous synthetic polymer support impregnated with a fragrance, wherein the synthetic polymer support is produced by bonding together small particles of solid polymer or coagulating a polymer solution in a non-solvent for the polymer, and vacuuming said room with the vacuum cleaner, such that said unit will release fragrance to said room by the passage of air over it caused by the application of differential air pressure by said vacuum cleaner.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |