Patent US5776218A successfully refreshed from Google Patents.
US5776218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duct insertion filter
Assignee: Individual
•
Filing: 1996-11-20
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Granted: 1998-07-07
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Expires: 2016-11-20
Abstract
Abstract A filter unit is provided for a forced air heating duct having an inside and an outlet end with a register. The unit includes a frame having a tapered body shaped to wedge within the duct adjacent the register. A filter is shaped to fit inside the duct and is disposed entirely between the duct and the register. The filter can be replaced by removing the register, while leaving the frame in place.
Inventors
- 👤 Victor Enns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:04
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0002; B01D46/0004; B01D46/10; B01D2265/00; B01D2265/02; Y; Y10; Y10S; Y10S55/00; Y10S55/31; Y10S55/35
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
119 words
A forced air ventilation apparatus comprising: a forced air ventilation duct having an inside and an outlet end; a register fitted to the duct outlet end; a frame having a tapered body shaped to wedge within the duct adjacent the register, the frame having an outer end facing the register and an inner end distal the register, the frame having sides which taper such that the inner end is smaller than the outer end; a filter shaped to fit the inside of the duct and located between the frame and the register, said filter being replaceable by removing the register while leaving the frame in place; and a hook and loop fastener which connects the filter to the frame.
Claim 2
Dependent Claim
119 words
A forced air ventilation apparatus comprising: a forced air ventilation duct having an inside and an outlet end; a register fitted to the duct outlet end; a frame having a tapered body shaped to wedge within the duct adjacent the register, the frame having an outer end facing the register and an inner end distal the register, the frame having sides which taper such that the inner end is smaller than the outer end; a filter shaped to fit the inside of the duct and located between the frame and the register, said filter being replaceable by removing the register while leaving the frame in place; and a hook and loop fastener which connects the filter to the frame.
Claim 3
Dependent Claim
17 words
A unit as claimed in claim 1, wherein the frame is rectangular, having a rectangular central opening.
Claim 4
Dependent Claim
13 words
A unit as claimed in claim 2, wherein the frame is of plastic.
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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) | 2001-07-06 | 2002-01-05 | 2002-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-06 | 2006-01-05 | 2006-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-06 | 2010-01-05 | 2010-07-07 | $7700.00 | Window Closed / Lapsed |