US4094234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter paper cup for a percolator and process for making the same
Assignee: Fort James Corp
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Filing: 1976-05-13
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Granted: 1978-06-13
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Expires: 1996-05-13
Abstract
Abstract A percolator having a cylindrical basket concentric with a wand is provided with a filter paper cup having an annular bottom coextensive with the bottom of the basket and having upstanding fluted sides, characterized in that the flutes are steam and heat set. The filter cups are formed by cutting and forming them into a nest of cups having an imporforate bottom, heating the nested cups, exposing them to moist steam, heating to dry the steamed cups, and cooling them to ambient temperature, transferring the nest of cups to a frusto-conical die having a circular top commensurate with the circular bottom of the filter cups, a central die-hole, and outwardly and downwardly flaring sides corresponding to the natural outward flare of the nested cups, and punching an axial hole in said nested cups while on said die by means of a punch complementary with said die-hole.
Inventors
- 👤 Wallace E. Olney
- 👤 Robert G. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:43
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/06; A47J31/08; B; B31; B31B; B31B2100/00; B31B2100/002; B31B2100/0024; B31B2110/00; B31B2110/10; B31B2110/20; B31B2120/00; B31B2120/70; Y; Y10; Y10S; Y10S493/00; Y10S493/941; Y10T; Y10T428/00; Y10T428/13; Y10T428/1303; Y10T428/24; Y10T428/24355; Y10T428/24446; Y10T428/24455
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
227 words
In a percolator for brewing coffee comprising a cylindrical basket concentric with a tubular wand, the combination therewith of a filter paper cup having a flat annular bottom coextensive with and lying flat on the bottom of said basket and having an integral upstanding steam and heat-set sidewall only at the outer periphery of said annular bottom, said upstanding sidewall being fluted with accordian pleat-type flutes and said flutes being under compression by the fact that said upstanding sidewall normally flares outwardly when unconfined by said basket, but is constrained to a vertical position by said basket, in which the filter paper is composed essentially of bleached cellulose fiber from chemically processed wood pulp, is uncalendered, is unsized, is creped from about 6 to about 15 percent, and has a basis weight between about 28 and about 40 pounds, in which the sidewalls of the filter cup have at least 1 flute every 15°, and in which said flutes are steam and heat set by heating the cups to a temperature of about 400° to 420° F to a moisture content between about 3 and about 6 percent while the sidewall is constrained in a cylindrical position, and substantially only the outermost apices of said flutes are substantially entirely in contiguous relationship with the inner wall of said basket into which said paper filter cup is placed.
Claim 2
Dependent Claim
227 words
In a percolator for brewing coffee comprising a cylindrical basket concentric with a tubular wand, the combination therewith of a filter paper cup having a flat annular bottom coextensive with and lying flat on the bottom of said basket and having an integral upstanding steam and heat-set sidewall only at the outer periphery of said annular bottom, said upstanding sidewall being fluted with accordian pleat-type flutes and said flutes being under compression by the fact that said upstanding sidewall normally flares outwardly when unconfined by said basket, but is constrained to a vertical position by said basket, in which the filter paper is composed essentially of bleached cellulose fiber from chemically processed wood pulp, is uncalendered, is unsized, is creped from about 6 to about 15 percent, and has a basis weight between about 28 and about 40 pounds, in which the sidewalls of the filter cup have at least 1 flute every 15°, and in which said flutes are steam and heat set by heating the cups to a temperature of about 400° to 420° F to a moisture content between about 3 and about 6 percent while the sidewall is constrained in a cylindrical position, and substantially only the outermost apices of said flutes are substantially entirely in contiguous relationship with the inner wall of said basket into which said paper filter cup is placed.
Claim 3
Dependent Claim
20 words
The percolator of claim 1, in which the sidewalls of the filter cup have at least 1 flute every 10°.
Claim 4
Dependent Claim
64 words
The percolator of claim 1, in which the basket has an axially disposed, tubular collar which projects upwardly from the bottom of said basket and embraces said wand with a sliding fit whereby the basket can be removed from said wand and in which the annular bottom of said filter cup extends from said upstanding sidewall to and terminates in contact with said collar.
Claim 5
Dependent Claim
20 words
The percolator of claim 3, in which the sidewalls of the filter cup have at least one flute every 10°.
Claim 6
Dependent Claim
245 words
A filter paper cup adapted for use in a percolator having a cylinderical basket concentric with a tubular wand comprising an annular bottom having an integral upstanding steam and heat-set wall only at the outer periphery of said annular bottom, said upstanding wall flaring outwardly and being fluted with accordian pleat-type flutes, and in which the filter paper is composed essentially of bleached cellulose fiber from chemically processed wood pulp, is uncalendered, is unsized, is creped from about 6 to about 15 percent, and has a basis weight between about 28 and about 40 pounds, in which there is at least one flute for every 15°, and in which said flutes are steam and heat set by heating the cup to a temperature of about 400° to 420° F, steaming with moist steam of about 90 percent quality, and then dried at a temperature of about 400° to 420° F to a moisture content between about 3 and about 6 percent while the sidewall is constrained in a cylindrical position, the outermost apices of said flutes being rectilinear so that, when the filter cup is inserted into the cylindrical basket of said percolator with the annular bottom of said filter cup being coextensive with and resting on the bottom of said basket and extending from said tubular wand to the outer wall of said cylindrical basket, substantially only the outermost apices of said flutes will be in substantially entirely contiguous relationship with said inner wall.
Claim 7
Dependent Claim
245 words
A filter paper cup adapted for use in a percolator having a cylinderical basket concentric with a tubular wand comprising an annular bottom having an integral upstanding steam and heat-set wall only at the outer periphery of said annular bottom, said upstanding wall flaring outwardly and being fluted with accordian pleat-type flutes, and in which the filter paper is composed essentially of bleached cellulose fiber from chemically processed wood pulp, is uncalendered, is unsized, is creped from about 6 to about 15 percent, and has a basis weight between about 28 and about 40 pounds, in which there is at least one flute for every 15°, and in which said flutes are steam and heat set by heating the cup to a temperature of about 400° to 420° F, steaming with moist steam of about 90 percent quality, and then dried at a temperature of about 400° to 420° F to a moisture content between about 3 and about 6 percent while the sidewall is constrained in a cylindrical position, the outermost apices of said flutes being rectilinear so that, when the filter cup is inserted into the cylindrical basket of said percolator with the annular bottom of said filter cup being coextensive with and resting on the bottom of said basket and extending from said tubular wand to the outer wall of said cylindrical basket, substantially only the outermost apices of said flutes will be in substantially entirely contiguous relationship with said inner wall.
Claim 8
Dependent Claim
18 words
The filter paper cup of claim 5, in which there is at least one flute for every 10°.
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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) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |