US3870494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grease filter for kitchen ventilators
Assignee: Individual
•
Filing: 1973-01-24
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Granted: 1975-03-11
•
Expires: 1993-01-24
Abstract
Abstract A grease filtering apparatus for kitchen ventilating systems which is readily interchangeable with conventional mesh-type filters. The filter has substantially the same external dimensions as a mesh-type filter and produces substantially the same pressure drop as a mesh-type filter, so that it can be readily interchanged with the mesh-type filter without changing the requirements on the blower which draws the exhaust stream through the ventilating system. The filter uses a series of baffles to direct the exhaust stream in a tortuous path as it passes through the filter, thereby removing the condensable greases and oils by depositing them on the internal surfaces of the filter by centrifugal and ram action. The filter is completely self draining, since the extracted liquids continuously run down over the interior surfaces of the filter and then drain out of the filter through a plurality of drain holes provided along the front edge of the bottom wall. The specific baffle arrangement illustrated includes an entrance baffle extending rearwardly from one of the elongated edges of each of a plurality of entrance openings, an interior baffle disposed on the opposite side of the entrance opening from each entrance baffle, and an exit baffle extending forwardly from one of the elongated edges of each of a plurality of exit openings positioned between pairs of adjacent entrance openings.
Inventors
- 👤 Dewitt H Doane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:07
CPC Classifications
B; B01; B01D; B01D45/00; B01D45/04; B01D45/08; F; F24; F24C; F24C15/00; F24C15/20; F24C15/2035; Y; Y10; Y10S; Y10S55/00; Y10S55/36
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
523 words
A grease filter for kitchen ventilating systems and the like, said filter comprising the combination of a housing that is elongated in the X and Y directions and less than 2 inches in the Z direction so that the housing will fit in the space normally provided for mesh-type filters in a kitchen ventilating system, said housing forming closed top and bottom walls lying substantially in X-Z planes, closed side walls lying substantially in the Y-Z planes, and front and rear walls lying substantially in X-Y planes, said front wall forming a multiplicity of spaced entrance openings which are uniformly elongated in the Y direction and relatively narrow in the X direction, each of said entrance openings formed by a pair of edges of said front wall elongated in the Y direction on opposite sides of the opening said rear wall forming a multiplicity of exit openings each of which is located midway between a pair of adjacent entrance openings, said exit openings also being uniformly elongated in the Y direction and relatively narrow in the X direction, a multiplicity of interior baffles lying substantially in Y-Z planes within said housing, each of said interior baffles comprising a single sheet of metal extending from a line midway between an adjacent pair of said exit openings on said rear wall to a line midway between an adjacent pair of said entrance openings on said front wall so that opposite sides of each of said interior baffles are exposed to said adjacent pair of entrance openings, a multiplicity of entrance baffles equal to the number of entrance openings extending into said housing from the elongated edges of said entrance openings, each of said entrance baffles extending from one of the elongated edges of one of said entrance openings toward the side wall or the interior baffle that is closest to said entrance opening with the rear edge of each entrance being spaced farther away from said closest sidewall or interior baffle than the other elongated edge of its entrance opening, the entrance baffle originating at the entrance opening edge in said front wall that is farther away from said closest side wall or interior baffle and extending toward said closest side wall or interior baffle at an acute angle relative to said front wall so as to deflect an entering exhaust stream toward said closest side wall or interior baffle as the exhaust stream passes rearwardly through said housing, and a multiplicity of exit baffles equal to the number of entrance baffles extending into said housing from the elongated edges of said exit openings, each of said exit baffles extending from an elongated edge of one of said exit openings toward the opposite elongated edge of the same exit opening at an acute angle relative to said rear wall so as to deflect the exhaust stream moving rearwardly from each entrance opening in the forward direction away from said rear wall before the exhaust stream is discharged through said exit opening, said bottom wall forming a multiplicity of drain openings adjacent said front wall and spaced away from said entrance openings in the X direction.
Claim 2
Dependent Claim
523 words
A grease filter for kitchen ventilating systems and the like, said filter comprising the combination of a housing that is elongated in the X and Y directions and less than 2 inches in the Z direction so that the housing will fit in the space normally provided for mesh-type filters in a kitchen ventilating system, said housing forming closed top and bottom walls lying substantially in X-Z planes, closed side walls lying substantially in the Y-Z planes, and front and rear walls lying substantially in X-Y planes, said front wall forming a multiplicity of spaced entrance openings which are uniformly elongated in the Y direction and relatively narrow in the X direction, each of said entrance openings formed by a pair of edges of said front wall elongated in the Y direction on opposite sides of the opening said rear wall forming a multiplicity of exit openings each of which is located midway between a pair of adjacent entrance openings, said exit openings also being uniformly elongated in the Y direction and relatively narrow in the X direction, a multiplicity of interior baffles lying substantially in Y-Z planes within said housing, each of said interior baffles comprising a single sheet of metal extending from a line midway between an adjacent pair of said exit openings on said rear wall to a line midway between an adjacent pair of said entrance openings on said front wall so that opposite sides of each of said interior baffles are exposed to said adjacent pair of entrance openings, a multiplicity of entrance baffles equal to the number of entrance openings extending into said housing from the elongated edges of said entrance openings, each of said entrance baffles extending from one of the elongated edges of one of said entrance openings toward the side wall or the interior baffle that is closest to said entrance opening with the rear edge of each entrance being spaced farther away from said closest sidewall or interior baffle than the other elongated edge of its entrance opening, the entrance baffle originating at the entrance opening edge in said front wall that is farther away from said closest side wall or interior baffle and extending toward said closest side wall or interior baffle at an acute angle relative to said front wall so as to deflect an entering exhaust stream toward said closest side wall or interior baffle as the exhaust stream passes rearwardly through said housing, and a multiplicity of exit baffles equal to the number of entrance baffles extending into said housing from the elongated edges of said exit openings, each of said exit baffles extending from an elongated edge of one of said exit openings toward the opposite elongated edge of the same exit opening at an acute angle relative to said rear wall so as to deflect the exhaust stream moving rearwardly from each entrance opening in the forward direction away from said rear wall before the exhaust stream is discharged through said exit opening, said bottom wall forming a multiplicity of drain openings adjacent said front wall and spaced away from said entrance openings in the X direction.
Claim 3
Dependent Claim
523 words
A grease filter for kitchen ventilating systems and the like, said filter comprising the combination of a housing that is elongated in the X and Y directions and less than 2 inches in the Z direction so that the housing will fit in the space normally provided for mesh-type filters in a kitchen ventilating system, said housing forming closed top and bottom walls lying substantially in X-Z planes, closed side walls lying substantially in the Y-Z planes, and front and rear walls lying substantially in X-Y planes, said front wall forming a multiplicity of spaced entrance openings which are uniformly elongated in the Y direction and relatively narrow in the X direction, each of said entrance openings formed by a pair of edges of said front wall elongated in the Y direction on opposite sides of the opening said rear wall forming a multiplicity of exit openings each of which is located midway between a pair of adjacent entrance openings, said exit openings also being uniformly elongated in the Y direction and relatively narrow in the X direction, a multiplicity of interior baffles lying substantially in Y-Z planes within said housing, each of said interior baffles comprising a single sheet of metal extending from a line midway between an adjacent pair of said exit openings on said rear wall to a line midway between an adjacent pair of said entrance openings on said front wall so that opposite sides of each of said interior baffles are exposed to said adjacent pair of entrance openings, a multiplicity of entrance baffles equal to the number of entrance openings extending into said housing from the elongated edges of said entrance openings, each of said entrance baffles extending from one of the elongated edges of one of said entrance openings toward the side wall or the interior baffle that is closest to said entrance opening with the rear edge of each entrance being spaced farther away from said closest sidewall or interior baffle than the other elongated edge of its entrance opening, the entrance baffle originating at the entrance opening edge in said front wall that is farther away from said closest side wall or interior baffle and extending toward said closest side wall or interior baffle at an acute angle relative to said front wall so as to deflect an entering exhaust stream toward said closest side wall or interior baffle as the exhaust stream passes rearwardly through said housing, and a multiplicity of exit baffles equal to the number of entrance baffles extending into said housing from the elongated edges of said exit openings, each of said exit baffles extending from an elongated edge of one of said exit openings toward the opposite elongated edge of the same exit opening at an acute angle relative to said rear wall so as to deflect the exhaust stream moving rearwardly from each entrance opening in the forward direction away from said rear wall before the exhaust stream is discharged through said exit opening, said bottom wall forming a multiplicity of drain openings adjacent said front wall and spaced away from said entrance openings in the X direction.
Claim 4
Dependent Claim
523 words
A grease filter for kitchen ventilating systems and the like, said filter comprising the combination of a housing that is elongated in the X and Y directions and less than 2 inches in the Z direction so that the housing will fit in the space normally provided for mesh-type filters in a kitchen ventilating system, said housing forming closed top and bottom walls lying substantially in X-Z planes, closed side walls lying substantially in the Y-Z planes, and front and rear walls lying substantially in X-Y planes, said front wall forming a multiplicity of spaced entrance openings which are uniformly elongated in the Y direction and relatively narrow in the X direction, each of said entrance openings formed by a pair of edges of said front wall elongated in the Y direction on opposite sides of the opening said rear wall forming a multiplicity of exit openings each of which is located midway between a pair of adjacent entrance openings, said exit openings also being uniformly elongated in the Y direction and relatively narrow in the X direction, a multiplicity of interior baffles lying substantially in Y-Z planes within said housing, each of said interior baffles comprising a single sheet of metal extending from a line midway between an adjacent pair of said exit openings on said rear wall to a line midway between an adjacent pair of said entrance openings on said front wall so that opposite sides of each of said interior baffles are exposed to said adjacent pair of entrance openings, a multiplicity of entrance baffles equal to the number of entrance openings extending into said housing from the elongated edges of said entrance openings, each of said entrance baffles extending from one of the elongated edges of one of said entrance openings toward the side wall or the interior baffle that is closest to said entrance opening with the rear edge of each entrance being spaced farther away from said closest sidewall or interior baffle than the other elongated edge of its entrance opening, the entrance baffle originating at the entrance opening edge in said front wall that is farther away from said closest side wall or interior baffle and extending toward said closest side wall or interior baffle at an acute angle relative to said front wall so as to deflect an entering exhaust stream toward said closest side wall or interior baffle as the exhaust stream passes rearwardly through said housing, and a multiplicity of exit baffles equal to the number of entrance baffles extending into said housing from the elongated edges of said exit openings, each of said exit baffles extending from an elongated edge of one of said exit openings toward the opposite elongated edge of the same exit opening at an acute angle relative to said rear wall so as to deflect the exhaust stream moving rearwardly from each entrance opening in the forward direction away from said rear wall before the exhaust stream is discharged through said exit opening, said bottom wall forming a multiplicity of drain openings adjacent said front wall and spaced away from said entrance openings in the X direction.
Claim 5
Dependent Claim
38 words
A grease filter as set forth in claim 1 wherein the rear edges of said entrance baffles and the front edges of said exit baffles are spaced away from each other in both the X and Z directions.
Claim 6
Dependent Claim
42 words
A grease filter as set forth in claim 1 wherein the distance between the front edges of the two exit baffles for each exit opening in the X direction is substantially twice the width of each eNtrance opening in the X direction.
Claim 7
Dependent Claim
37 words
A grease filter as set forth in claim 1 wherein the width of each entrance baffle, between its front and rear edges, is substantially the same as the width of each entrance opening in the X direction.
Claim 8
Dependent Claim
58 words
A grease filter as set forth in claim 1 wherein the distance between any point on any of said baffles and any other surface inside said housing, other than the surfaces to which each respective baffle is connected, is at least as great in the X-Y plane as the width of said entrance openings in the X direction.
Claim 9
Dependent Claim
22 words
A grease filter as set forth in claim 1 wherein said entrance baffles are formed as integral parts of said front wall.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |