Patent US1256383A successfully refreshed from Google Patents.
Patent US4057707A successfully refreshed from Google Patents.
US4057707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heating unit
Assignee: Corning Glass Works
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Filing: 1975-10-17
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Granted: 1977-11-08
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Expires: 1995-10-17
Abstract
Abstract An electrical cooking or heating unit comprising a plate of a glassy material inluding a selected portion thereof upon whose upper surface vessels are to be placed for cooking purposes. The lower surface of the selected portion of the plate is provided with at least one sinuous strip of a gold/platinum alloy which integrally forms the electrical resistance heating element for the heating or cooking unit. A porous and partially sintered overglaze or coating covers the heating element and the portion of the lower surface of the plate on which the heating element is provided, such glaze preventing or inhibiting cracking, peeling or agglomeration of the heating element to provide a resultant increase in electrical resistivity. The life of the heating or cooking unit is thereby substantially increased.
Inventors
- 👤 Richard E. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:58
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/68; H05B3/74; H05B3/748; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
124 words
An electrical cooking or heating unit comprising; I. a thin flat plate of a glassy material and having relatively smooth upper and lower surfaces with a portion of said plate selected as a heating portion upon whose upper surface vessels are to be placed for cooking purposes; Ii. an electrical resistance heating element integral with said lower surface of said selected portion of said plate, such heating element being formed of at least one sinuous strip of an electrical resistance alloy comprising by weight from about 90 to 98% platinum with the remainder being substantially gold; and Iii. a porous and partially sintered glaze covering said heating element and integral with such element and said lower surface of said selected portion of said plate.
Claim 2
Dependent Claim
124 words
An electrical cooking or heating unit comprising; I. a thin flat plate of a glassy material and having relatively smooth upper and lower surfaces with a portion of said plate selected as a heating portion upon whose upper surface vessels are to be placed for cooking purposes; Ii. an electrical resistance heating element integral with said lower surface of said selected portion of said plate, such heating element being formed of at least one sinuous strip of an electrical resistance alloy comprising by weight from about 90 to 98% platinum with the remainder being substantially gold; and Iii. a porous and partially sintered glaze covering said heating element and integral with such element and said lower surface of said selected portion of said plate.
Claim 3
Dependent Claim
25 words
An electrical cooking or heating unit in accordance with claim 1 and in which said alloy comprises by weight about 95% platinum and 5% gold.
Claim 4
Dependent Claim
31 words
An electrical cooking or heating unit in accordance with claim 1 and in which said alloy comprises by weight about 91 to 94% platinum, 5% gold and 1 to 4% rhodium.
Claim 5
Dependent Claim
110 words
In combination with a flat and relatively smooth thin glass-ceramic plate for a cooking or heating unit and having a portion thereof selected to provide a heating portion having an upper surface for supporting vessels for cooking purposes, a heating element integral with the lower surface of said selected portion of said plate, such element including; I. at least one sinuous strip of an electrical resistance heating alloy comprising by weight from about 90 to 98% platinum with the remainder being substantially gold; and Ii. a porous partially sintered glaze integrally covering said electrical resistance heating alloy and part of said lower surface of said selected portion of said plate.
Claim 6
Dependent Claim
110 words
In combination with a flat and relatively smooth thin glass-ceramic plate for a cooking or heating unit and having a portion thereof selected to provide a heating portion having an upper surface for supporting vessels for cooking purposes, a heating element integral with the lower surface of said selected portion of said plate, such element including; I. at least one sinuous strip of an electrical resistance heating alloy comprising by weight from about 90 to 98% platinum with the remainder being substantially gold; and Ii. a porous partially sintered glaze integrally covering said electrical resistance heating alloy and part of said lower surface of said selected portion of said plate.
Claim 7
Dependent Claim
24 words
A plate and heating element in accordance with claim 4 and in which said alloy comprises by weight about 95% platinum and 5% gold.
Claim 8
Dependent Claim
30 words
A plate and heating element in accordance with claim 4 and in which said alloy comprises by weight about 91 to 94% platinum, 5% gold and 1 to 4% rhodium.
References Cited (Backward Citations)
US636203A
Cited
US3349722A
Cited
US3496336A
Cited
US3778305A
Cited
US3883719A
Cited
US3931496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |