US4029940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percolator
Assignee: Hamilton Beach Brands Inc
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Filing: 1975-06-09
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Granted: 1977-06-14
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Expires: 1995-06-09
Abstract
Abstract An electric percolator having a liquid containing section formed from an assembly of glass and other materials fixed together by means of a locking collar. The lid of the percolator is held in place by means of a quick-release latching mechanism which prevents the lid from being disengaged by the lifting motion normally used to open a lid and instead requires a twisting motion which rapidly releases the lid. Simplified electrical circuitry in the percolator utilizes a single lamp that indicates both the "Brewing" and the "Keep Warm" modes of percolator operation. A method is also set forth for assembling a composite apparatus, having a glass component which does not require threading, strapping or gluing of the glass component.
Inventors
- 👤 John Littell Eaton, Jr.
- 👤 Richard Henry Brill
- 👤 Walter E. Myers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:22
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/04; A47J31/053
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
234 words
An electrical circuit for lighting a lamp in response to the heating mode of an electric appliance comprising: a pair of power terminals; a primary heating means; a secondary impedance means having first and second portions; a lamp means; a thermally sensitive switch means; a first serially connected current loop including one of said power terminals, said thermally sensitive switch means, said primary heating means and said other of said power terminals; a second serially connected current loop including one of said power terminals, said thermally sensitive switch means said first portion of said second impedance means, said lamp means and said other power terminal; a third serially connected current loop including one of said power terminals, said thermally sensitive switch means, said second portion of said secondary impedance means, said lamp means and said other of said power terminals; a fourth serially connected current loop including one of said power terminals, said thermally sensitive switch means, said first and second portions of said secondary impedance means, said primary heating means and the other of said power terminals; said thermally sensitive switch means operative to conduct current in said first, second and third current loops to provide a high heat mode of operation and operative to conduct current in said third and fourth current loops in response to temperature sensed by said thermally sensitive switch means to provide a low heat mode of operation.
Claim 2
Dependent Claim
234 words
An electrical circuit for lighting a lamp in response to the heating mode of an electric appliance comprising: a pair of power terminals; a primary heating means; a secondary impedance means having first and second portions; a lamp means; a thermally sensitive switch means; a first serially connected current loop including one of said power terminals, said thermally sensitive switch means, said primary heating means and said other of said power terminals; a second serially connected current loop including one of said power terminals, said thermally sensitive switch means said first portion of said second impedance means, said lamp means and said other power terminal; a third serially connected current loop including one of said power terminals, said thermally sensitive switch means, said second portion of said secondary impedance means, said lamp means and said other of said power terminals; a fourth serially connected current loop including one of said power terminals, said thermally sensitive switch means, said first and second portions of said secondary impedance means, said primary heating means and the other of said power terminals; said thermally sensitive switch means operative to conduct current in said first, second and third current loops to provide a high heat mode of operation and operative to conduct current in said third and fourth current loops in response to temperature sensed by said thermally sensitive switch means to provide a low heat mode of operation.
Claim 3
Dependent Claim
79 words
The electric circuit for lighting a lamp in response to the heating mode of an electric appliance according to claim 1 wherein: said thermally sensitive switch means has first and second contact points; said first and second current loops include said second contact points of said thermally sensitive switch means; and said second contact points of said thermally sensitive switch means are closed in said high heat mode of operation and open in said low heat mode of operation.
Claim 4
Dependent Claim
31 words
The electric circuit for lighting a lamp in response to the heating mode of an electric appliance according to claim 2, wherein said secondary impedance means includes a secondary heating means.
Claim 5
Dependent Claim
88 words
The electric circuit for lighting a lamp in response to the heating mode of an electric appliance according to claim 3 wherein: said first contact points are connected to said secondary heating means at a first point on said secondary heating means; said second contact points are connected to said secondary heating means at a second point on said secondary heating means; and said lamp means is connected to said secondary heating means at a point intermediate said first and said second points on said secondary heating means.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |