Patent US4281592A successfully refreshed from Google Patents.
US4281592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double induction unit
Assignee: H&C ACQUISITION CORP
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Filing: 1979-08-06
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Granted: 1981-08-04
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Expires: 1999-08-06
Abstract
Abstract An air induction unit having a first induction means to induce secondary air through a first induction opening into a stream of primary air to produce an air stream of mixed primary and secondary air, and a second induction means to induce additional secondary air into the mixed air stream through a second induction opening.
Inventors
- 👤 Dale E. Maxson
- 👤 David Ober
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:11
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/26; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87571; Y10T137/87587; Y10T137/87595
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
229 words
An air induction unit comprising: a primary air inlet for receiving a supply of primary air from a supply duct; an outlet for delivering air toward a point of use; a first induction section associated with said primary air inlet, a second induction section, and an air duct connecting said first induction section to said second induction section; said first induction section comprising a first secondary air inlet for delivering secondary air into said unit and a first induction means responsive to the flow of primary air to induce a flow of secondary air into said unit through said first secondary air inlet to form a stream of mixed primary and secondary air for delivery to said second induction section through said connecting duct; said second induction section comprising an expansion unit having a throat connected to said connecting duct and diverging walls downstream from said throat, a second secondary air inlet for delivering secondary air into said unit, and a second induction means effective proximate said throat and responsive to the flow of said mixed air stream to induce a flow of additional secondary air into said unit through said secondary air inlet for mixture with said mixed air stream; and a wall between said first induction section and said second induction section so as to prevent communication within said unit between the respective induced secondary air flows.
Claim 2
Dependent Claim
229 words
An air induction unit comprising: a primary air inlet for receiving a supply of primary air from a supply duct; an outlet for delivering air toward a point of use; a first induction section associated with said primary air inlet, a second induction section, and an air duct connecting said first induction section to said second induction section; said first induction section comprising a first secondary air inlet for delivering secondary air into said unit and a first induction means responsive to the flow of primary air to induce a flow of secondary air into said unit through said first secondary air inlet to form a stream of mixed primary and secondary air for delivery to said second induction section through said connecting duct; said second induction section comprising an expansion unit having a throat connected to said connecting duct and diverging walls downstream from said throat, a second secondary air inlet for delivering secondary air into said unit, and a second induction means effective proximate said throat and responsive to the flow of said mixed air stream to induce a flow of additional secondary air into said unit through said secondary air inlet for mixture with said mixed air stream; and a wall between said first induction section and said second induction section so as to prevent communication within said unit between the respective induced secondary air flows.
Claim 3
Dependent Claim
248 words
An air induction unit comprising: a primary air inlet for receiving a supply of primary air from a supply duct; an outlet for delivering air toward a point of use; a first induction section associated with said primary air inlet, a second induction section, and an air duct connecting said first induction section to said second induction section; said first induction section comprising a first secondary air inlet for delivering secondary air into said unit and a first induction means responsive to the flow of primary air to induce a flow of secondary air into said unit through said first secondary air inlet to form a stream of mixed primary and secondary air for delivery to said second induction section through said connecting duct; said second induction section comprising an expansion unit having a throat connected to said connecting duct and diverging walls downstream from said throat, a second secondary air inlet for delivering secondary air into said unit, a damper in operative relationship with said second secondary air inlet to automatically close said inlet so as to prevent air flow out of said unit through said second secondary air inlet in the absence of a flow of secondary air therethrough into said air induction unit, and a second induction means effective proximate said throat and responsive to the flow of said mixed air stream to induce a flow of additional secondary air into said unit through said secondary air inlet for mixture with said mixed air stream.
Claim 4
Dependent Claim
248 words
An air induction unit comprising: a primary air inlet for receiving a supply of primary air from a supply duct; an outlet for delivering air toward a point of use; a first induction section associated with said primary air inlet, a second induction section, and an air duct connecting said first induction section to said second induction section; said first induction section comprising a first secondary air inlet for delivering secondary air into said unit and a first induction means responsive to the flow of primary air to induce a flow of secondary air into said unit through said first secondary air inlet to form a stream of mixed primary and secondary air for delivery to said second induction section through said connecting duct; said second induction section comprising an expansion unit having a throat connected to said connecting duct and diverging walls downstream from said throat, a second secondary air inlet for delivering secondary air into said unit, a damper in operative relationship with said second secondary air inlet to automatically close said inlet so as to prevent air flow out of said unit through said second secondary air inlet in the absence of a flow of secondary air therethrough into said air induction unit, and a second induction means effective proximate said throat and responsive to the flow of said mixed air stream to induce a flow of additional secondary air into said unit through said secondary air inlet for mixture with said mixed air stream.
Claim 5
Dependent Claim
35 words
An air induction unit according to claim 2 wherein said damper is biased by gravity to close said secondary air inlet in absence of a flow of secondary air therethrough into said air induction unit.
Claim 6
Dependent Claim
38 words
An air induction unit according to either claim 1 or 2 wherein said second induction means comprises an opening in a wall of said expansion unit proximate said throat for delivery of secondary air into said expansion unit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |