US3854912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined grease trap and air filter for range hoods
Assignee: LAU PROD Ltd
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Filing: 1972-09-11
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Granted: 1974-12-17
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Expires: 1992-09-11
Abstract
Abstract A combined, self-contained unitary filter element including both a grease trap-type air filter and an air-cleansing or purifyingtype filter, in particular, loose, particulate filtration media such as activated charcoal granules, with both types of filter advantageously combined into a unitary, self-contained unit in which the grease trap member forms a dished receptacle for the particulate media.
Inventors
- 👤 G Terrel
- 👤 F Mcculley
- 👤 R Hause
- 👤 A Hancox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:15
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; B01D46/30; B01D50/00; Y; Y10; Y10S; Y10S55/00; Y10S55/36
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
A combination grease trap and air filter, comprising: a perforate grease trap structure having apertured layers sandwiched together such that the apertures in different ones of said layers are non-aligned to thereby define a plurality of at least partially obstructed air passages therethrough, said grease trap structure being of a dished configuration formed of said sandwiched layers and having a predetermined depth and having side and bottom portions defining a receptacle; and a layer of air filtration media disposed and retained within said receptacle.
Claim 2
Dependent Claim
84 words
A combination grease trap and air filter, comprising: a perforate grease trap structure having apertured layers sandwiched together such that the apertures in different ones of said layers are non-aligned to thereby define a plurality of at least partially obstructed air passages therethrough, said grease trap structure being of a dished configuration formed of said sandwiched layers and having a predetermined depth and having side and bottom portions defining a receptacle; and a layer of air filtration media disposed and retained within said receptacle.
Claim 3
Dependent Claim
14 words
The combination filter of claim 1, wherein said air filatration media comprises particulate material.
Claim 4
Dependent Claim
30 words
The combination filter of claim 2, wherein said particulate material comprises discrete loose particles retained in place at least in part By said side and bottom portions of said receptacle.
Claim 5
Dependent Claim
19 words
The combination filter of claim 3, and including a cover means extending over the top of said particulate material.
Claim 6
Dependent Claim
25 words
The combination filter of claim 4, including frame means engaging said dished grease trap structure for retaining said cover means in place with respect thereto.
Claim 7
Dependent Claim
36 words
The combination filter of claim 5, wherein said cover means has peripheral portions disposed generally in alignment with peripheral portions of said dished grease trap structure, and said frame means connects such aligned peripheral portions together.
Claim 8
Dependent Claim
14 words
The combination filter of claim 6, wherein said frame means comprises a peripheral frame.
Claim 9
Dependent Claim
41 words
The combination filter of claim 6, wherein said cover means comprises a perforate member which closes the top of said receptacle, said cover member having peripheral edges generally matching and in alignment with the peripheral edges of said grease trap structure.
Claim 10
Dependent Claim
30 words
The combination filter of claim 8, wherein said cover member defines an opening therethrough for access to the interior of said receptacle, and including a closure member for such opening.
Claim 11
Dependent Claim
25 words
The combination filter of claim 4, wherein said cover means comprises a bag-like member containing said particulate material and comprising a unitary replacable element therewith.
Claim 12
Dependent Claim
19 words
The combination filter of claim 1, wherein said perforate grease trap structure comprises plural layers of openwork sheet members.
Claim 13
Dependent Claim
22 words
The combination filter of claim 11, wherein said plural layers include a top and bottom layer and at least one intermediate layer.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |