US3695167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for filtering coffee
Assignee: Joh Jacobs und Co GmbH
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Filing: 1970-01-28
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Granted: 1972-10-03
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Expires: 1990-01-28
Abstract
Abstract A coffee filter having a square bottom sealed to four upright sides to form an open topped canister. The bottom and sides are scored by cooperating fold lines whereby the filter may be collapsed to a flat shape. The bottom has one or more perforations and is covered by a sheet of filter paper on the inside.
Inventors
- 👤 Ernest G F H Schmidt
- 👤 Bernhard Walkowsky
- 👤 Wilfried Christoph Wilhe Grote
- 👤 Matthias Janssen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:21
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/44; A47J31/4403; A47J31/446
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
106 words
A collapsible liquid filter adapted when opened to be placed on the top of an open vessel for use in making coffee comprising: a side wall section having four side walls foldable along their connecting edges with upright fold lines in the middle of two opposite side walls, and a square base member secured to the side wall section having two intersecting fold lines extending diagonally through the corners and a central fold line parallel to two opposite sides of the base member and lying midway therebetween, the upright fold lines and the central fold line folding inwardly when the filter is in a collapsed position.
Claim 2
Dependent Claim
106 words
A collapsible liquid filter adapted when opened to be placed on the top of an open vessel for use in making coffee comprising: a side wall section having four side walls foldable along their connecting edges with upright fold lines in the middle of two opposite side walls, and a square base member secured to the side wall section having two intersecting fold lines extending diagonally through the corners and a central fold line parallel to two opposite sides of the base member and lying midway therebetween, the upright fold lines and the central fold line folding inwardly when the filter is in a collapsed position.
Claim 3
Dependent Claim
16 words
A liquid filter as defined in claim 1 wherein the filter is made of metal foil.
Claim 4
Dependent Claim
24 words
A liquid filter as defined in claim 1 wherein the filter is coated on at least one side with a sealable synthetic plastic material.
Claim 5
Dependent Claim
41 words
A liquid filter as defined in claim 1 wherein the base member is downwardly depressed at its center in the open position to form a funnel, and further comprising at least one aperture in the base member in its central region.
Claim 6
Dependent Claim
22 words
A liquid filter as defined in claim 1 wherein the side walls taper downwards to form a truncated pyramid side wall section.
Claim 7
Dependent Claim
55 words
A liquid filter as defined in claim 1 wherein the lower edge of the side wall section is folded inwardly and upwardly to form a downwardly projecting lower rim, and the outer edges of the base member and filter paper are folded downwardly inside of the upwardly folded lower edge of the side wall section.
Claim 8
Dependent Claim
43 words
A liquid filter as defined in claim 6 wherein the filter top is coated on at least one side with a sealable synthetic plastic material, and the base member is secured to the bottom edges of the sidewall section by sealing the coating.
Claim 9
Dependent Claim
42 words
A liquid filter as defined in claim 1, further comprising a filter paper covering the inner bottom region of the opened filter and secured thereto around its edges, the side wall having serrated edges for engaging the top of the open vessel.
Claim 10
Dependent Claim
99 words
A collapsible liquid filter made of foldable material for filtering liquids and capable of being stored in a flat state comprising: side wall members and a bottom member connected to the side wall members, at least two side wall members opposite each other have fold lines, the bottom member having fold lines which run diagonally through the corners and intersect each other and at least one other fold line which extends from one fold line in one side wall member through the intersection point of the diagonal fold lines to the fold line on the opposite side wall member.
Claim 11
Dependent Claim
99 words
A collapsible liquid filter made of foldable material for filtering liquids and capable of being stored in a flat state comprising: side wall members and a bottom member connected to the side wall members, at least two side wall members opposite each other have fold lines, the bottom member having fold lines which run diagonally through the corners and intersect each other and at least one other fold line which extends from one fold line in one side wall member through the intersection point of the diagonal fold lines to the fold line on the opposite side wall member.
Claim 12
Dependent Claim
27 words
A collapsible liquid filter as in claim 9, where the side wall fold line and its adjacent bottom member fold line fold inward in a collapsed position.
Claim 13
Dependent Claim
26 words
A collapsible liquid filter as in claim 10, where the bottom member in an open position has a pyramid shape with an opening at its apex.
Claim 14
Dependent Claim
32 words
A collapsible liquid filter as in claim 10, where the side walls have at their bottom edges, individual projections adapted to engage a rim of a vessel for holding the filtered liquid.
Claim 15
Dependent Claim
140 words
A blank for forming a collapsible liquid filter container to be positioned on the top of an open vessel for receiving the filtered liquid, the blank comprising: a first rectangular member having parallel fold lines dividing the member into four equal panels, alternate panels have parallel central fold lines equally dividing their respective panels, and a second substantially square member connected along a fold line with a panel not having a center fold line, the square member having a central aperture with a pair of diagonal lines intersecting the aperture from each corner and a central fold intersecting the aperture and extending parallel to the axis of the rectangular member whereby the lower edges of each panel adjacent the side of the square member can be attached to the periphery of the square member to form the collapsible filter container.
Claim 16
Dependent Claim
140 words
A blank for forming a collapsible liquid filter container to be positioned on the top of an open vessel for receiving the filtered liquid, the blank comprising: a first rectangular member having parallel fold lines dividing the member into four equal panels, alternate panels have parallel central fold lines equally dividing their respective panels, and a second substantially square member connected along a fold line with a panel not having a center fold line, the square member having a central aperture with a pair of diagonal lines intersecting the aperture from each corner and a central fold intersecting the aperture and extending parallel to the axis of the rectangular member whereby the lower edges of each panel adjacent the side of the square member can be attached to the periphery of the square member to form the collapsible filter container.
Claim 17
Dependent Claim
30 words
A blank as in claim 13, including folding edge portions connected to three of the panels of the first rectangular member and three of the sides of the square member.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |