US5176570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtered cold air baseboard return
Assignee: Individual
•
Filing: 1991-06-20
•
Granted: 1993-01-05
•
Expires: 2011-06-20
Abstract
Abstract A filtered cold air return register particularly for base board units which provides for a removable replacement filter section in combination with the normally provided duct covering or end section. The unit provides a filter device for the return air prior to its recycling by the furnace or air conditioning fan.
Inventors
- 👤 Loren Liedl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:53
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/082; F24F13/085; F24F13/28; Y; Y10; Y10S; Y10S55/00; Y10S55/31
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
187 words
A filtered cold air baseboard return for use with forced air heating systems which systems includes ductwork for forced and return air transmittal, such return including: a) a duct end covering arranged and constructed for placement on and attachment to the end of a cold air return duct; b) said duct end covering having an air flow passage therethrough for receiving air from an area and returning it to the forced air system; c) the front surface of said duct end covering providing a substantially flat surface; d) means for positioning a filter medium in filtering relation to said air flow passage and against said frontal surface of said duct end; e) said filter positioning means including a housing of a size to cover said air flow passage of said duct end; f) said housing including means for removeably positioning a filtering medium therein; g) said housing including means for positioning an air seal in position surrounding said filtering medium and in position to seal against said frontal surface of said duct end; and h) means for removably attaching said filter positioning housing to said duct end.
Claim 2
Dependent Claim
187 words
A filtered cold air baseboard return for use with forced air heating systems which systems includes ductwork for forced and return air transmittal, such return including: a) a duct end covering arranged and constructed for placement on and attachment to the end of a cold air return duct; b) said duct end covering having an air flow passage therethrough for receiving air from an area and returning it to the forced air system; c) the front surface of said duct end covering providing a substantially flat surface; d) means for positioning a filter medium in filtering relation to said air flow passage and against said frontal surface of said duct end; e) said filter positioning means including a housing of a size to cover said air flow passage of said duct end; f) said housing including means for removeably positioning a filtering medium therein; g) said housing including means for positioning an air seal in position surrounding said filtering medium and in position to seal against said frontal surface of said duct end; and h) means for removably attaching said filter positioning housing to said duct end.
Claim 3
Dependent Claim
41 words
The filtered cold air baseboard return as set forth in claim 1, and said means for removably attaching said filter positioning housing including rotatable locking flaps on said filter positioning housing and flap receiving areas defined on said duct end covering.
References Cited (Backward Citations)
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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) | 1996-01-05 | 1996-07-06 | 1997-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-05 | 2000-07-06 | 2001-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-05 | 2004-07-06 | 2005-01-05 | $7700.00 | Window Closed / Lapsed |