US4740303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal filter foil
Assignee: Maxs AG
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Filing: 1986-12-03
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Granted: 1988-04-26
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Expires: 2006-12-03
Abstract
Abstract A metal filter foil has elongated slits forming the filter openings. The slits are arranged in a plurality of groups. In each group the slits are parallel to one another, and the slits of different groups form an angle with one another.
Inventors
- 👤 Albert Greutert
- 👤 Ruedi Gasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:10
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/4609; B07B1/469; A; A47; A47J; A47J19/00; A47J19/02; A47J19/027; A47J31/00; A47J31/44; A47J31/4403; A47J31/446; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/23; B01D29/44; B01D39/00; B01D39/10; B04; B04B; B04B7/00; B04B7/08; B04B7/12; B04B7/16; B01D2201/00; B01D2201/02; B01D2201/18; B01D2201/184
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
A metal filter foil for use in filtering solid particles from a fluid comprising: a frame including ribs; a smooth foil body having edges, the edges embedded in the ribs; alternating rows of first and second sets of parallel filter slits formed in the body, the slits of the first sets of slits oriented in a first direction, the slits of the second sets of slits oriented in a second direction, the first and second directions forming a chosen angle of between 30° to 175° to one another to create a herringbone pattern of said sets of slits; and the filter slits sized to prevent the solid particles from passing therethrough.
Claim 2
Dependent Claim
111 words
A metal filter foil for use in filtering solid particles from a fluid comprising: a frame including ribs; a smooth foil body having edges, the edges embedded in the ribs; alternating rows of first and second sets of parallel filter slits formed in the body, the slits of the first sets of slits oriented in a first direction, the slits of the second sets of slits oriented in a second direction, the first and second directions forming a chosen angle of between 30° to 175° to one another to create a herringbone pattern of said sets of slits; and the filter slits sized to prevent the solid particles from passing therethrough.
Claim 3
Dependent Claim
32 words
The filter foil of claim 1 further comprising a third set of parallel filter slits formed in a body, the slits of the third set of slits oriented in a third direction.
Claim 4
Dependent Claim
17 words
The filter foil of claim 2 wherein the first sets of slits has a first longitudinal orientation.
Claim 5
Dependent Claim
17 words
The filter foil of claim 3 wherein the third direction is parallel to the first longitudinal orientation.
Claim 6
Dependent Claim
17 words
The filter foil of claim 3 wherein the third direction is perpendicular to the first longitudinal orientation.
Claim 7
Dependent Claim
15 words
The filter foil of claim 1 wherein the chosen angle is between 70° and 110°.
Claim 8
Dependent Claim
157 words
A metal filter foil for use in a coffee filter to filter coffee grounds from liquid comprising: a frame including ribs; a smooth metal foil having edges, and edge zone adjacent the edges and a central zone, edges embedded in the ribs; alternating rows of first and second sets of parallel filter slits formed in the body, the slits of the first sets of slits oriented in a first direction, the slits of the second sets of slits oriented in a second direction, the first and second directions forming a chosen angle of between 30° and 175° to one another, the first and second sets of filter slits arranged in a herringbone pattern at the edge zone; a third set of parallel filter slits formed in the central zone of the body, the slits of the third set of slits oriented in a third direction; and the filter slits sized to prevent coffee grounds from passing therethrough.
Claim 9
Dependent Claim
157 words
A metal filter foil for use in a coffee filter to filter coffee grounds from liquid comprising: a frame including ribs; a smooth metal foil having edges, and edge zone adjacent the edges and a central zone, edges embedded in the ribs; alternating rows of first and second sets of parallel filter slits formed in the body, the slits of the first sets of slits oriented in a first direction, the slits of the second sets of slits oriented in a second direction, the first and second directions forming a chosen angle of between 30° and 175° to one another, the first and second sets of filter slits arranged in a herringbone pattern at the edge zone; a third set of parallel filter slits formed in the central zone of the body, the slits of the third set of slits oriented in a third direction; and the filter slits sized to prevent coffee grounds from passing therethrough.
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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) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |