US4194042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallized glass-ceramic cooking vessels exhibiting extended service life
Assignee: Corning Glass Works
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Filing: 1978-09-21
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Granted: 1980-03-18
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Expires: 1998-09-21
Abstract
Abstract Aluminum-coated glass-ceramic cooking vessels exhibiting extended service life under use conditions are provided by limiting the ultimate tensile strength of the heat-distributing aluminum coating.
Inventors
- 👤 Harold F. Dates
- 👤 Joseph E. Nitsche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:38
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/02; A47J36/04; C; C03; C03C; C03C17/00; C03C17/06; C23; C23C; C23C4/00; C23C4/04; C23C4/06; C23C4/08; C03C2217/00; C03C2217/20; C03C2217/25; C03C2217/251; C03C2217/252; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/112; C03C2218/13; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/937; Y10T; Y10T428/00; Y10T428/26; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
78 words
In an article of glass-ceramic cookware comprising a glass-ceramic vessel composed of a lithium aluminosilicate glass-ceramic material having a thermal expansion coefficient not exceeding about 25×10 -7 /°C., at least a portion of the surface of said vessel having a sprayed coating of metallic aluminum having a thickness of at least about 18 mils bonded thereto, the improvement which comprises: forming the coating from sprayed aluminum having an ultimate tensile strength within the range of about 500-3000 psi.
Claim 2
Dependent Claim
78 words
In an article of glass-ceramic cookware comprising a glass-ceramic vessel composed of a lithium aluminosilicate glass-ceramic material having a thermal expansion coefficient not exceeding about 25×10 -7 /°C., at least a portion of the surface of said vessel having a sprayed coating of metallic aluminum having a thickness of at least about 18 mils bonded thereto, the improvement which comprises: forming the coating from sprayed aluminum having an ultimate tensile strength within the range of about 500-3000 psi.
Claim 3
Dependent Claim
26 words
An article of glass-ceramic cookware in accordance with claim 1 wherein the coating of metallic aluminum has a thickness in the range of about 20-30 mils.
Claim 4
Dependent Claim
24 words
An article of glass-ceramic cookware in accordance with claim 1 wherein the coating of metallic aluminum is provided by a powder flame spraying process.
Claim 5
Dependent Claim
30 words
An article of glass-ceramic cookware in accordance with claim 1 wherein the coating is formed from sprayed aluminum having an ultimate tensile strength within the range of about 900-1600 psi.
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) | 1983-03-18 | 1983-09-17 | 1984-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-18 | 1987-09-17 | 1988-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-18 | 1991-09-17 | 1992-03-18 | $7700.00 | Window Closed / Lapsed |