Patent US3935112A successfully refreshed from Google Patents.
US3935112A
Expired / Lapsed
US
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Reusable coffee filter
Assignee: Maxon Motor AG
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Filing: 1974-07-08
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Granted: 1976-01-27
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Expires: 1994-07-08
Abstract
Abstract A reusable coffee filter with a pot-shaped hotwater container and a filter strainer adjacent an opening in the bottom of said container. The filter strainer is made of metallic sieve sheets having perforations flaring out in the flow direction. On top of the hotwater container a distribution plate is supportably held which has a plurality of holes distributed over an area corresponding to the vertical projection of the opening of the filter strainer in order to ensure a good wetting and extraction efficiency of the coffee powder.
Inventors
- 👤 Albert Greutert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:29
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/06; A47J31/0631; A47J31/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
119 words
A reusable coffee filter comprising: a. a pot-shaped hot water container having a bottom wall defining an opening of a diameter smaller than the diameter of the hot water container; b. a frustro-conical filter strainer made of metallic sieve sheets depending from the opening in said pot-shaped hot water container, the bottom of said frustro-conical strainer comprising a horizontal sieve sheet; and c. a water distribution pan supported within said hot water container by means located at the top thereof, said pan having a bottom wall containing a large number of small holes distributed over a portion of the bottom wall vertically aligned with the opening in said hot water container and somewhat smaller in extent than that opening.
Claim 2
Dependent Claim
119 words
A reusable coffee filter comprising: a. a pot-shaped hot water container having a bottom wall defining an opening of a diameter smaller than the diameter of the hot water container; b. a frustro-conical filter strainer made of metallic sieve sheets depending from the opening in said pot-shaped hot water container, the bottom of said frustro-conical strainer comprising a horizontal sieve sheet; and c. a water distribution pan supported within said hot water container by means located at the top thereof, said pan having a bottom wall containing a large number of small holes distributed over a portion of the bottom wall vertically aligned with the opening in said hot water container and somewhat smaller in extent than that opening.
Claim 3
Dependent Claim
37 words
A coffee filter in accordance with claim 1 wherein said distribution pan has a rim extending over the top of said container, the axial dimension of said rim being less than one-third the height of said container.
Claim 4
Dependent Claim
42 words
A coffee filter in accordance with claim 1, wherein the small holes in said distribution pan are so dimensioned as to have a flow resistance corresponding to an efflux time of between 10 and 30 seconds for the filling of said container.
References Cited (Backward Citations)
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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) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |