US4220541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for brewing coffee or the like
Assignee: Individual
•
Filing: 1977-12-28
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Granted: 1980-09-02
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Expires: 1997-12-28
Abstract
Abstract A filter for exterior supportless brewing of coffee and the like consisting of an annular sector disc carton and a circular filter paper. The filter paper is placed concentrically in the disc carton when folded in a funnel fashion. A recess of triangular shape can be provided in the outer periphery to form a collar on the funnel.
Inventors
- 👤 Soo-Duck Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:16
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/06; A47J31/08; A47J31/44; A47J31/4403; A47J31/446
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
Filter for brewing coffee, tea or the like, intended to throw-away use and for being used without a supporting holder, consisting of a carton having the form of an annular disc having a sector quadrant removed when being in a flat position and having a funnel-shaped form when being erected, and a circular filter paper being placed concentrically on the inside of the carton whereby water is able to pour through the filter in the center area; wherein a recess of triangular form is formed in the outer periphery of the carton, an apex of the recess being directed radially outwards, whereby in erected position of the carton the peripheral area of the carton can be folded along a peripheral line through the recesses so that a collar is formed around the carton.
Claim 2
Dependent Claim
133 words
Filter for brewing coffee, tea or the like, intended to throw-away use and for being used without a supporting holder, consisting of a carton having the form of an annular disc having a sector quadrant removed when being in a flat position and having a funnel-shaped form when being erected, and a circular filter paper being placed concentrically on the inside of the carton whereby water is able to pour through the filter in the center area; wherein a recess of triangular form is formed in the outer periphery of the carton, an apex of the recess being directed radially outwards, whereby in erected position of the carton the peripheral area of the carton can be folded along a peripheral line through the recesses so that a collar is formed around the carton.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |