Patent US4487691A successfully refreshed from Google Patents.
US4487691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deep fat fryer with swivel filter element
Assignee: Thermo Fisher Scientific Inc
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Filing: 1984-01-09
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Granted: 1984-12-11
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Expires: 2004-01-09
Abstract
Abstract Disclosed is a deep fat fryer with a filtration system to continuously filter liquid cooking fat circulated by a pump. A fryer filter with a filter element of material such as carbon-impregnated cloth is located in the bottom of a fry tank and is rotatable about a swivel joint between a horizontal operating position and a vertical servicing position. In the vertical position the upper end of the filter is above the surface of the fat in the fry tank and the filter element may readily be replaced without draining the tank and without risk of leakage of fat.
Inventors
- 👤 Robert A. Panora
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:37
CPC Classifications
A; A47; A47J; A47J37/00; A47J37/12; A47J37/1233; Y; Y10; Y10S; Y10S210/00; Y10S210/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
173 words
In a deep fat fryer including a tank for holding cooking fat, a filter for filtering the fat, and circulating means for withdrawing fat from the tank and then returning fat to said tank, the improvement wherein said filter is positioned in the bottom of said tank and includes an outer casing having a plurality of holes for discharge of fat, a filter element within said casing, an inlet for receiving fat to be filtered, and lock means for permitting removal and replacement of said filter element, said circulating means includes a return conduit extending through said tank and connected to the inlet of said filter for delivering fat to the filter, said conduit having a swivel joint permitting rotation of said filter from a generally horizontal position to a generally vertical position, and said outer casing of the filter having a length such that upon rotation of the filter to a generally vertical position a portion of said filter including said lock means extends above the normal surface level of said fat.
Claim 2
Dependent Claim
173 words
In a deep fat fryer including a tank for holding cooking fat, a filter for filtering the fat, and circulating means for withdrawing fat from the tank and then returning fat to said tank, the improvement wherein said filter is positioned in the bottom of said tank and includes an outer casing having a plurality of holes for discharge of fat, a filter element within said casing, an inlet for receiving fat to be filtered, and lock means for permitting removal and replacement of said filter element, said circulating means includes a return conduit extending through said tank and connected to the inlet of said filter for delivering fat to the filter, said conduit having a swivel joint permitting rotation of said filter from a generally horizontal position to a generally vertical position, and said outer casing of the filter having a length such that upon rotation of the filter to a generally vertical position a portion of said filter including said lock means extends above the normal surface level of said fat.
Claim 3
Dependent Claim
16 words
A deep fat fryer as in claim 1 wherein said filter element comprises a carbon-impregnated cloth.
Claim 4
Dependent Claim
29 words
A deep fat fryer as in claim 2 wherein said filter element is mounted on a screen adjacent to the inner surface of said outer casing of the filter.
Claim 5
Dependent Claim
121 words
A deep fat fryer as in claim 1 wherein said outer casing has a generally flattened, cylindrical shape and an opening in each of its opposed ends, and said filter further comprises: a pipe running the length of said casing and extending through said openings in the opposed ends of the outer casing, said pipe including an open end connected to said return conduit, a closed end extending through the opening in the end of said casing opposite the inlet of said filter, and at least one outlet in the portion of the pipe within said casing for outflow of fat from said pipe; and a seal around said pipe at said openings in the opposed ends of the outer casing.
Claim 6
Dependent Claim
56 words
A deep fat fryer as in claim 4 wherein said lock means includes a fastener removably attached to the closed end of said pipe adjacent to the end of the casing opposite the inlet of said filter; and said seals around the pipe are slidable with said casing along the pipe upon removal of said fastener.
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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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |