Patent US3848111A successfully refreshed from Google Patents.
US3848111A
Expired / Lapsed
US
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Electrical heating unit
Assignee: Corning Glass Works
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Filing: 1973-09-24
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Granted: 1974-11-12
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Expires: 1993-09-24
Abstract
Abstract An electrical heating unit including a plate or panel of a glassy material having in intimate physical contact with a surface of the plate, in a selected area of the plate surface, a 240 volt heating element comprising a pair of electrical resistance conductors extending in sinuous parallel paths over the contacted area of the panel surface, and circuit means for normally connecting the conductors across opposite terminals of a 240 volt source of electrical energy with a single set of temperature responsive contacts included in the circuit means for interrupting electrical energy to the conductors when the temperature of the heating unit reaches a preselected maximum temperature.
Inventors
- 👤 H Brouneus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:43
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/26; H05B3/265; H05B3/68; H05B3/74; H05B3/748; H05B2203/00; H05B2203/002; H05B2203/003
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
121 words
An electrical heating unit comprising; A. a panel of a glassy material, B. a 240 volt heating element including a pair of first and second electrical resistance conductors in physical contact with a surface of said panel in a selected area of such panel and extending over such surface in first and second sinuous paths paralleling each other throughout the lengths thereof, C. first circuit means including a single set of normally closed and thermally actuated contacts for connecting first adjacent ends of said conductors with each other, and D. second circuit means for connecting the second adjacent ends of said first and second conductors with first and second opposite terminals, respectively, of a commercial 240 volt source of alternating current.
Claim 2
Dependent Claim
121 words
An electrical heating unit comprising; A. a panel of a glassy material, B. a 240 volt heating element including a pair of first and second electrical resistance conductors in physical contact with a surface of said panel in a selected area of such panel and extending over such surface in first and second sinuous paths paralleling each other throughout the lengths thereof, C. first circuit means including a single set of normally closed and thermally actuated contacts for connecting first adjacent ends of said conductors with each other, and D. second circuit means for connecting the second adjacent ends of said first and second conductors with first and second opposite terminals, respectively, of a commercial 240 volt source of alternating current.
Claim 3
Dependent Claim
22 words
A heating unit as in claim 1 and in which said conductors each comprise a narrow continuous strip of a metallic film.
Claim 4
Dependent Claim
19 words
A heating unit as in claim 1 and in which said conductors each comprise a narrow strip of foil.
Claim 5
Dependent Claim
17 words
A heating unit as in claim 1 and in which said glassy material is a glass-ceramic material.
Claim 6
Dependent Claim
17 words
A heating unit as in claim 2 and in which said glassy material is a glass-ceramic material.
Claim 7
Dependent Claim
17 words
A heating unit as in claim 3 and in which said glassy material is a glass-ceramic material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |