US3890887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust hood
Assignee: Elsters Inc
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Filing: 1974-01-16
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Granted: 1975-06-24
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Expires: 1994-01-16
Abstract
Abstract An improved exhaust hood of the type designed for disposure over a cooking surface and for connection to a ventilation system for removing smoke, vapors, and cooking odors, and for providing fresh air to the same work area. The improved Exhaust Hood includes a ventilation door on the front thereof disposed in cooperation with the source of ''''temperature controlled'''' fresh air so as to direct the air toward the cooking surface when in one position and to direct air both outward and downward in front of the exhaust hood when in a second position to provide ''''temperature controlled'''' air at adjacent work stations.
Inventors
- 👤 Arnold S Kaufman
- 👤 Albert Sweet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:50
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/20; Y; Y10; Y10S; Y10S55/00; Y10S55/36
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
227 words
An Exhaust Hood comprising: a. means for defining an exhaust plenum for collecting fumes and vapors and delivering them to an exhaust outlet; b. means defining a front plenum for coupling to a source of air; c. means for directing air from said front plenum in a predetermined direction for passage at least in part along a flow path leading toward said exhaust plenum; and d. a ventilation door on the front of said Exhaust Hood and in communication with said plenum, said ventilation door being movable from a closed position to an open position to direct air from said plenum generally outward and downward from said Exhaust Hood, said ventilation door being rotatable about a horizontal axis between said closed position and said open position, and having an upper portion above said horizontal axis and a lower portion below said horizontal axis, the front of said upper portion of said door above said axis and the rear of the lower portion of said door below said axis engaging cooperatively disposed members on said plenum when said door is closed, said door being movable to said open position by movement of said lower portion of said door outward whereby air from the plenum may flow outward over the top of said door and between the lower portion of said door and the front of said Exhaust Hood.
Claim 2
Dependent Claim
227 words
An Exhaust Hood comprising: a. means for defining an exhaust plenum for collecting fumes and vapors and delivering them to an exhaust outlet; b. means defining a front plenum for coupling to a source of air; c. means for directing air from said front plenum in a predetermined direction for passage at least in part along a flow path leading toward said exhaust plenum; and d. a ventilation door on the front of said Exhaust Hood and in communication with said plenum, said ventilation door being movable from a closed position to an open position to direct air from said plenum generally outward and downward from said Exhaust Hood, said ventilation door being rotatable about a horizontal axis between said closed position and said open position, and having an upper portion above said horizontal axis and a lower portion below said horizontal axis, the front of said upper portion of said door above said axis and the rear of the lower portion of said door below said axis engaging cooperatively disposed members on said plenum when said door is closed, said door being movable to said open position by movement of said lower portion of said door outward whereby air from the plenum may flow outward over the top of said door and between the lower portion of said door and the front of said Exhaust Hood.
Claim 3
Dependent Claim
28 words
The Exhaust Hood of claim 1 further comprised of a removable grill on the front of said hood and disposed over said upper portion of said ventilation door.
Claim 4
Dependent Claim
71 words
The Exhaust Hood of claim 1 wherein said lower portion of said ventilation door overlaps the edges of the opening therebehind to said plenum, said door further having a member fastened to the rear side thereof and projecting through said opening, said last named member having an outward and downward projecting flange overlapping the edges of said opening thereby defining the extent of rotation of said door about said horizontal axis.
Claim 5
Dependent Claim
38 words
The Exhaust Hood of claim 1, further comprised of a latch to retain said door in said closed position, said door being balanced so as to be self encouraging to said open position upon release of said latch.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |