US3943058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reusable coffee filter
Assignee: Maxon Motor AG
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Filing: 1974-11-25
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Granted: 1976-03-09
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Expires: 1994-11-25
Abstract
Abstract A device for the preparation of filtered coffee is described. It has a permanent filter disk which can be reused, thus eliminating the need for frequent replacement.
Inventors
- 👤 Alfred Wurm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:33
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/06; A47J31/0631; A47J29/00; A47J29/02; A47J31/02; A47J31/44; A47J31/4403; A47J31/4475; A47J31/4478
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
A filtering device for extraction of coffee by means of hot water, comprising a vessel for accommodating a quantity of water, said vessel having a relatively wide opening at the bottom thereof, a permanent filter disk closing said opening, a cylindrical separating receptacle of relatively smaller diameter than said disk affixed centrally thereto, and a water distribution cover over said vessel, said cover having a water passage opening arranged above said separating receptacle, said opening not exceeding the diameter of said receptacle.
Claim 2
Dependent Claim
82 words
A filtering device for extraction of coffee by means of hot water, comprising a vessel for accommodating a quantity of water, said vessel having a relatively wide opening at the bottom thereof, a permanent filter disk closing said opening, a cylindrical separating receptacle of relatively smaller diameter than said disk affixed centrally thereto, and a water distribution cover over said vessel, said cover having a water passage opening arranged above said separating receptacle, said opening not exceeding the diameter of said receptacle.
Claim 3
Dependent Claim
24 words
A filtering device in accordance with Claim 1, wherein the section of said separating receptacle equals the cross section of said water passage opening.
Claim 4
Dependent Claim
28 words
A filtering device in accordance with Claim 1 wherein said separating receptacle is held within said vessel by radially extending bars solidly attached to the inner wall thereof.
References Cited (Backward Citations)
US2948618A
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US3080810A
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US3250398A
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US3166003A
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US3695167A
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US3800690A
Cited
US3823656A
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US3770842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |