US4875912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scented furnace filter
Assignee: Individual
•
Filing: 1988-02-05
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Granted: 1989-10-24
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Expires: 2008-02-05
Abstract
Abstract A combination of a furnace filter and a scented evaporant packet inserted in a cut out portion of the filter. The evaporant is contained and wrapped in foil when not in use. Upon partial or entire removal of the foil by a tear tab, the evaporant is exposed to the air flowing in the cold air duct of a furnace--Such as used in dwellings, thereby the entire house may be scented. The secondary purpose of the evaporant is to give an indication of when the filter has to be replaced. This will occur when the scent is no longer evident in the air.
Inventors
- 👤 Thomas L. Fulmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:13
CPC Classifications
A; A61; A61L; A61L9/00; A61L9/015; A61L9/04; A61L9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
In combination with a filter mounted in a frame for use in a household furnace for mounting in the cold air return of said furnace, a cut-out portion in said filter, a relatively small packet of scenting material inserted into and filling the entire area of said cut-out portion, said packet being sealed by a rear cover and a front cover for said scenting material having a substantially triangular tear tab for progressively exposing at least a portion of said scenting material to enable selective exposure of only the front portion of said scenting material, said tear tab being so located on said front cover as to expose only a portion of the scenting material, leaving uncovered a surrounding portion of the exposed area so that such surrounding portion serves as a reservoir for supplying scenting material to replace that which is discharged from said cut-out portion so as to lengthen the life of the scenting material.
Claim 2
Dependent Claim
157 words
In combination with a filter mounted in a frame for use in a household furnace for mounting in the cold air return of said furnace, a cut-out portion in said filter, a relatively small packet of scenting material inserted into and filling the entire area of said cut-out portion, said packet being sealed by a rear cover and a front cover for said scenting material having a substantially triangular tear tab for progressively exposing at least a portion of said scenting material to enable selective exposure of only the front portion of said scenting material, said tear tab being so located on said front cover as to expose only a portion of the scenting material, leaving uncovered a surrounding portion of the exposed area so that such surrounding portion serves as a reservoir for supplying scenting material to replace that which is discharged from said cut-out portion so as to lengthen the life of the scenting material.
References Cited (Backward Citations)
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US3065915A
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US4028073A
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US4145001A
Cited
US4712737A
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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) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |