US4039771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coffee maker
Assignee: Danfoss AS
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Filing: 1976-12-10
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Granted: 1977-08-02
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Expires: 1996-12-10
Abstract
Abstract The invention relates to a coffee maker assembly which has a heat exchanger having inlet and outlet pipes. Heat for the heat exchanger is supplied by an electrical heating element. In one embodiment a PTC resistor is in series with the heating element and thermal connections are provided between the resistor and other parts of the system. This allows thermal conditions to be sensed which alter the resistance of the PTC resistor to effect a temperature control by varying the magnitude of current supplied to the heating element. Another embodiment illustrates the heating element itself being formed by an annularly shaped PTC resistor.
Inventors
- 👤 Flemming Thorsoe
- 👤 Niels Lervad Andersen
- 👤 John Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:06
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/44; A47J31/54; A47J31/56; A47J31/04; A47J31/057; A47J31/0573
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A coffee maker assembly comprising a heat exchanger having a cold water inlet pipe and a hot water outlet pipe, electrical heating means for and in close proximity to said heat exchanger, a power supply circuit connected to said electrical heating means, a PTC resistor in said circuit and being thermally connected to said cold water inlet pipe and to the downstream end of said heat exchanger, one end of said heat exchanger and one of said pipes forming an outwardly open annularly shaped well, said resistor being annularly shaped and disposed in said well.
Claim 2
Dependent Claim
95 words
A coffee maker assembly comprising a heat exchanger having a cold water inlet pipe and a hot water outlet pipe, electrical heating means for and in close proximity to said heat exchanger, a power supply circuit connected to said electrical heating means, a PTC resistor in said circuit and being thermally connected to said cold water inlet pipe and to the downstream end of said heat exchanger, one end of said heat exchanger and one of said pipes forming an outwardly open annularly shaped well, said resistor being annularly shaped and disposed in said well.
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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |