Patent US5333152A successfully refreshed from Google Patents.
US3552298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drip-type coffee maker
Assignee: Toastmaster Inc
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Filing: 1969-04-17
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Granted: 1971-01-05
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Expires: 1989-04-17
Abstract
Abstract A drip-type coffee maker with a heating plate having passage means from an upper inlet to a lower outlet, and having a primary heater operable to heat water flowing through the passage means to an outlet temperature sufficient for brewing coffee, a thermostat operable at a given low-limit temperature to energize the primary heater, and a secondary heater effective under continuous operation in normal ambient condition with no water contacting the heating plate to maintain the heating plate above the low-limit temperature to preclude cycling of the primary heater and further with the residual heat in the heating plate to heat even the initial water discharge from the lower outlet to an elevated temperature.
Inventors
- 👤 Dale E Bufkin
- 👤 Willard G Murphy
- 👤 Norman A Beam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:58
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/10; A47J31/106
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
157 words
In a drip-type coffee maker, the combination comprising a heating element having through passage means, a primary heater for the heating element having an output sufficient to heat liquid passing through the passage means at some determinable rate to an outlet temperature sufficient to brew coffee, a thermostat operable at a low-limit temperature to energize the primary heater, a secondary heater for the heating element having an output sufficient under continuous operation and in normal ambient conditions with no liquid contacting the heating element to raise the thermostat temperature above said low-limit temperature, and means admitting water to the heating element for discharge from the passage means at said determinable rate or less, whereby water initially admitted to the heating element passage means not only causes the thermostat to energize the primary heater but also is heated by the residual heat of the preheated heating element without appreciable delay to an outlet temperature suitable for brewing coffee.
Claim 2
Dependent Claim
157 words
In a drip-type coffee maker, the combination comprising a heating element having through passage means, a primary heater for the heating element having an output sufficient to heat liquid passing through the passage means at some determinable rate to an outlet temperature sufficient to brew coffee, a thermostat operable at a low-limit temperature to energize the primary heater, a secondary heater for the heating element having an output sufficient under continuous operation and in normal ambient conditions with no liquid contacting the heating element to raise the thermostat temperature above said low-limit temperature, and means admitting water to the heating element for discharge from the passage means at said determinable rate or less, whereby water initially admitted to the heating element passage means not only causes the thermostat to energize the primary heater but also is heated by the residual heat of the preheated heating element without appreciable delay to an outlet temperature suitable for brewing coffee.
Claim 3
Dependent Claim
27 words
A drip-type coffee maker combination according to claim 1, wherein the heating element comprises a generally solid plate having openings therethrough that form the through passage means.
Claim 4
Dependent Claim
30 words
A drip-type coffee maker Combination according to claim 2, wherein the plate has on the upper surface thereof spiral grooves and further wherein the plate openings extend from the grooves.
Claim 5
Dependent Claim
40 words
A drip-type coffee maker combination according to claim 1, wherein a vessel suitable for holding liquid is disposed over the heating element, and wherein the vessel has an outlet suitable for discharging liquid to be admitted to the heating element.
Claim 6
Dependent Claim
42 words
A drip-type coffee maker combination according to claim 4, wherein the vessel outlet and the heating element passage means have combined resistances to flow of water effective for metering water flow through the heating element to said mentioned determinable rate or less.
Claim 7
Dependent Claim
20 words
A drip-type coffee maker combination according to claim 5, wherein the vessel has a plug suitable for closing the outlet.
Claim 8
Dependent Claim
40 words
A drip-type coffee maker combination according to claim 1, wherein a perforated basket is located below the heating element suitable for holding coffee grounds, and wherein a vessel is located below the coffee basket suitable for collecting liquid discharge therefrom.
Claim 9
Dependent Claim
119 words
A drip-type coffee maker, comprising a heating element, means for admitting water to the inlet of the heating element, a basket at the outlet of the heating element for holding coffee grounds, a vessel below the coffee basket for collecting liquid discharge therefrom, a primary heater for the heating element having an output sufficient to heat liquid passing from the inlet to the outlet to a temperature sufficient to brew coffee, a thermostat operable at a low-limit temperature to energize the primary heater, and a secondary heater for the heating element having an output sufficient under continuous operation and in normal ambient conditions with no liquid contacting the heating element to raise the thermostat temperature above said low-limit temperature.
Claim 10
Dependent Claim
119 words
A drip-type coffee maker, comprising a heating element, means for admitting water to the inlet of the heating element, a basket at the outlet of the heating element for holding coffee grounds, a vessel below the coffee basket for collecting liquid discharge therefrom, a primary heater for the heating element having an output sufficient to heat liquid passing from the inlet to the outlet to a temperature sufficient to brew coffee, a thermostat operable at a low-limit temperature to energize the primary heater, and a secondary heater for the heating element having an output sufficient under continuous operation and in normal ambient conditions with no liquid contacting the heating element to raise the thermostat temperature above said low-limit temperature.
Claim 11
Dependent Claim
31 words
A drip-type coffee maker according to claim 8, wherein passage means is defined between the heating element inlet and outlet, and wherein said passage means is void of any valve means.
Claim 12
Dependent Claim
60 words
A drip-type coffee maker according to claim 9, wherein the means for admitting water to the inlet of the heating element includes a vessel for holding water and having an outlet, and the passage means and the vessel outlet has such combined resistances to flow to preclude discharge from the heating element outlet below a temperature suitable for brewing coffee.
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |