Patent US3682089A successfully refreshed from Google Patents.
US3682089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric coffee percolator
Assignee: Sunbeam Corp
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Filing: 1970-06-30
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Granted: 1972-08-08
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Expires: 1990-06-30
Abstract
Abstract An electric coffee percolator having a glass vessel with an opening in the bottom through which a metallic well for a pump assembly extends. Associated with the well are electric heating elements for both operating the percolator pump and keeping the contents of the vessel warm after coffee making has been completed. The seal between the metallic heater and well portion and the glass vessel is accomplished by an annular gasket which is of substantial vertical height and includes an undercut at the lower edge thereof to receive and lock the glass vessel portion in sealed engagement with the metallic well portion. All of the functional parts enclosed in the base of the percolator including the thermostat, the main heating element, and the keep warm heater are supported in a unitary assembly which rests upon a plastic base from which the handle is also supported. The upper portion of the handle includes a simple latch which detachably engages the upper edge of the glass vessel, the latch actuating portion being easily accessible to the hand of the user and in its released position being substantially exposed so as to warn the user that the latch is not engaged with the glass vessel.
Inventors
- 👤 John J Unger
- 👤 Robert J Augustine
- 👤 Farees U Khaja
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:30
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/04; A47J31/053
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
173 words
A coffee percolator of the type having a base assembly on which a glass vessel is detachably mounted, the improvement comprising a heater assembly on said base assembly, said heater assembly having a pump well formed with an upwardly facing well portion with a first heating element mounted in good heat transfer relation with the underside of said well portion, a second heating element disposed within said pump well around said well portion above said first heating element, said glass vessel having a bottom opening which is sealed to the outer periphery of said pump well, said pump well extending into said vessel to provide good heat transfer between said first and second heating elements and the liquid within said vessel, a thermostat connected in circuit to control said first heating element in response to the temperature of liquid within said vessel, said thermostat being supported on a heat conducting bracket having its upper end mounted on said pump well at a point outwardly of said well portion and positioned within said vessel.
Claim 2
Dependent Claim
173 words
A coffee percolator of the type having a base assembly on which a glass vessel is detachably mounted, the improvement comprising a heater assembly on said base assembly, said heater assembly having a pump well formed with an upwardly facing well portion with a first heating element mounted in good heat transfer relation with the underside of said well portion, a second heating element disposed within said pump well around said well portion above said first heating element, said glass vessel having a bottom opening which is sealed to the outer periphery of said pump well, said pump well extending into said vessel to provide good heat transfer between said first and second heating elements and the liquid within said vessel, a thermostat connected in circuit to control said first heating element in response to the temperature of liquid within said vessel, said thermostat being supported on a heat conducting bracket having its upper end mounted on said pump well at a point outwardly of said well portion and positioned within said vessel.
Claim 3
Dependent Claim
62 words
The coffee percolator of claim 1 wherein said pump well includes a wall portion spaced outwardly from said first heating element and positioned within said glass vessel in contact with the liquid contained therein, said thermostat bracket being mounted on said wall portion to respond accurately to the temperature of said liquid and positioned in spaced relation to said first heating element.
Claim 4
Dependent Claim
186 words
A coffee percolator of the type having a base assembly on which a glass vessel is detachably mounted, the improvement comprising a heater assembly on said base assembly, said heater assembly having a pump well formed with an upwardly facing well portion with a first heating element mounted in good heat transfer relation with the underside of said well portion, a second heating element disposed within said pump well around said well portion above said first heating element, said glass vessel having a bottom opening which is sealed to the outer periphery of said pump well, said pump well extending into said vessel to provide good heat transfer between said first and second heating elements and the liquid within said vessel, said pump well is formed with an annular top wall extending outwardly from said well portion and depending side walls forming an annular heater chamber within which said first and second heating elements are disposed, said first heating element being brazed to said well portion and said second heating element being assembled against said annular top wall to heat the liquid outside of said portion.
Claim 5
Dependent Claim
186 words
A coffee percolator of the type having a base assembly on which a glass vessel is detachably mounted, the improvement comprising a heater assembly on said base assembly, said heater assembly having a pump well formed with an upwardly facing well portion with a first heating element mounted in good heat transfer relation with the underside of said well portion, a second heating element disposed within said pump well around said well portion above said first heating element, said glass vessel having a bottom opening which is sealed to the outer periphery of said pump well, said pump well extending into said vessel to provide good heat transfer between said first and second heating elements and the liquid within said vessel, said pump well is formed with an annular top wall extending outwardly from said well portion and depending side walls forming an annular heater chamber within which said first and second heating elements are disposed, said first heating element being brazed to said well portion and said second heating element being assembled against said annular top wall to heat the liquid outside of said portion.
Claim 6
Dependent Claim
196 words
A coffee percolator of the type having a base assembly on which a glass vessel is detachably mounted, the improvement comprising a heater assembly on said base assembly, said heater assembly having a pump well formed with an upwardly facing well portion with a first heating element mounted in good heat transfer relation with the underside of said well portion, a second heating element disposed within said pump well around said well portion above said first heating element, said glass vessel having a bottom opening which is sealed to the outer periphery of said pump well, said pump well extending into said vessel to provide good heat transfer between said first and second heating elements and the liquid within said vessel, said pump well is formed with a top wall extending outwardly from said well portion and walls depending from said top wall to form a heater chamber which extends at least in part into said glass vessel, a thermostat for controlling said first heating element in response to said liquid temperature, and a bracket extending downwardly from said top wall to support said thermostat in good heat transfer relation with the liquid in said vessel.
Claim 7
Dependent Claim
196 words
A coffee percolator of the type having a base assembly on which a glass vessel is detachably mounted, the improvement comprising a heater assembly on said base assembly, said heater assembly having a pump well formed with an upwardly facing well portion with a first heating element mounted in good heat transfer relation with the underside of said well portion, a second heating element disposed within said pump well around said well portion above said first heating element, said glass vessel having a bottom opening which is sealed to the outer periphery of said pump well, said pump well extending into said vessel to provide good heat transfer between said first and second heating elements and the liquid within said vessel, said pump well is formed with a top wall extending outwardly from said well portion and walls depending from said top wall to form a heater chamber which extends at least in part into said glass vessel, a thermostat for controlling said first heating element in response to said liquid temperature, and a bracket extending downwardly from said top wall to support said thermostat in good heat transfer relation with the liquid in said vessel.
Claim 8
Dependent Claim
162 words
A coffeemaker comprising a base assembly including first and second heating elements and a theRmostatic control switch, a glass vessel which is detachably mounted on said base assembly with an enlarged opening in the bottom into which a portion of said base assembly extends, means sealing said portion of said base assembly to said glass vessel to form an open topped container for brewing coffee, said base assembly including a heater assembly having a pump well which is secured to an annular plate, said plate supporting said vessel with said pump well extending upwardly into said vessel, said well being a formed sheet metal member having a centrally disposed well portion and defining a heater chamber surrounding said well portion, said first heating element being in good heat transfer relation to said well portion and said second heating element being in said heater chamber spaced from said well portion and in good heat transfer relation with said portion extending into said vessel.
Claim 9
Dependent Claim
162 words
A coffeemaker comprising a base assembly including first and second heating elements and a theRmostatic control switch, a glass vessel which is detachably mounted on said base assembly with an enlarged opening in the bottom into which a portion of said base assembly extends, means sealing said portion of said base assembly to said glass vessel to form an open topped container for brewing coffee, said base assembly including a heater assembly having a pump well which is secured to an annular plate, said plate supporting said vessel with said pump well extending upwardly into said vessel, said well being a formed sheet metal member having a centrally disposed well portion and defining a heater chamber surrounding said well portion, said first heating element being in good heat transfer relation to said well portion and said second heating element being in said heater chamber spaced from said well portion and in good heat transfer relation with said portion extending into said vessel.
Claim 10
Dependent Claim
88 words
The coffeemaker of claim 5 wherein said sealing means comprises an annular gasket received in a peripherally extending channel on said pump well, said gasket having a gradually outwardly sloping surface extending from the top thereof adjacent said pump well toward said annular plate, a continuous recess behind a skirt portion extending around the lower edge of said gasket, the portion of said vessel defining said opening compressing said gasket as it moves downwardly on said sloping surface into a seated position compressing said skirt into said recess.
Claim 11
Dependent Claim
59 words
The coffeemaker of claim 5 wherein said base assembly includes a cup-shaped plastic base supporting a handle and electric terminals thereon, an assembly stud secured to said well portion and extending through said base, retaining means on said stud below said base to clamp said heater assembly to said base, rigid conductors connecting said terminals to said heating elements.
Claim 12
Dependent Claim
54 words
The coffeemaker of claim 5 wherein said base assembly includes a cup-shaped base having upwardly extending side walls terminating in a shouldered lip, said annular plate having a downturned flange received over said lip, assembly means secured to said well portion and extending through said base to clamp said base and heater assembly together.
Claim 13
Dependent Claim
147 words
A heater assembly for an electric glass vessel percolator comprising a pump well formed of sheet metal adapted for insertion into the bottom of a glass coffee making vessel, said pump well including a well portion having an upwardly facing recess, a sheathed electrical heating element formed in a plurality of loops brazed to the outer surface of said well portion, an annular top wall on said pump well extending outwardly from said well portion, depending peripheral side walls on said top wall forming an annular heater chamber, a flexible heating element encircling said well portion and lying against the underside of said annular top wall, a thermostatic switch connected in circuit with said sheathed heating element, and a bracket mounted on said annular top wall extending downwardly from the underside thereof and supporting said switch to respond to the temperature of liquid contained within said vessel.
Claim 14
Dependent Claim
147 words
A heater assembly for an electric glass vessel percolator comprising a pump well formed of sheet metal adapted for insertion into the bottom of a glass coffee making vessel, said pump well including a well portion having an upwardly facing recess, a sheathed electrical heating element formed in a plurality of loops brazed to the outer surface of said well portion, an annular top wall on said pump well extending outwardly from said well portion, depending peripheral side walls on said top wall forming an annular heater chamber, a flexible heating element encircling said well portion and lying against the underside of said annular top wall, a thermostatic switch connected in circuit with said sheathed heating element, and a bracket mounted on said annular top wall extending downwardly from the underside thereof and supporting said switch to respond to the temperature of liquid contained within said vessel.
Claim 15
Dependent Claim
58 words
The heater assembly of claim 9 including a cover plate secured to the bottom of said pump well to close said annular heater chamber, said plate being secured to said well portion at its center, integrally formed legs extending upwardly from said plate into said chamber to urge said flexible heater against the bottom of said annular wall.
Claim 16
Dependent Claim
53 words
The heater assembly of claim 10 including a supporting annular plate having an inner rim clamped between said pump well depending side walls and said cover plate, said annular plate supporting said vessel thereon, sealing means received in a peripheral channel in said side walls to seal said vessel to said pump well.
Claim 17
Dependent Claim
67 words
The heater assembly of claim 10 wherein said heater chamber is provided with an inwardly facing annular recess adjacent said top wall, a C-shaped resilient ring having its outer edge received within said annular recess and engaging said fLexible heater to retain it within said heater chamber, said legs on said cover plate engaging said ring and retaining said ring in clamping engagement with said flexible heater.
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |