Patent FR1534552A successfully refreshed from Google Patents.
Patent US4056650A successfully refreshed from Google Patents.
US4056650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making aluminum-coated glass-ceramic cooking vessel and article produced thereby
Assignee: Corning Glass Works
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Filing: 1976-08-09
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Granted: 1977-11-01
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Expires: 1996-08-09
Abstract
Abstract Aluminum-coated glass-ceramic cookware of improved performance and durability is provided by a process comprising selecting a glass-ceramic vessel of specified strength and expansion characteristics, preheating the surface of the vessel to a temperature in the range of about 120°-600° C., flame-spraying molten powdered aluminum metal onto the surface of the vessel, optionally heat-treating the thus-coated vessel to provide an aluminum metal coating of excellent adherence and good thermal conductivity thereon, providing the aluminum coating with a film of phosphoric acid and heating said aluminum coating and film to a temperature at least sufficient to decompose the phosphoric acid. A supplemental oxide film may also be applied to protect the aluminum metal coating.
Inventors
- 👤 Harold F. Dates
- 👤 Joseph J. Domicone
- 👤 Joseph E. Nitsche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:10
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/34; C03C17/36; C03C17/3602; C03C17/3605; C03C17/3649; C23; C23C; C23C4/00; C23C4/04; C23C4/06; C23C4/08; C23C4/18; C03C2217/00; C03C2217/70; C03C2217/78; Y; Y10; Y10T; Y10T428/00; Y10T428/26
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
141 words
A process for producing an aluminum-coated glass-ceramic cooking vessel exhibiting improved thermal durability which comprises the steps of: a. selecting a glass-ceramic vessel composed of a lithium aluminosilicate glass-ceramic material comprising a principal crystal phase consisting of beta-spodumene solid solution; b. preheating at least a selected surface portion of the glass-ceramic vessel to a temperature in the range of about 120°-600° C; c. applying to the preheated selected surface portion a molten aluminum metal spray, said spray being produced by melting an aluminum metal powder and being applied in a quantity sufficient to provide an aluminum metal coating on the vessel having a thickness in the range of about 18-28 mils; d. providing the aluminum coating with a film of phosphoric acid; and e. heating said aluminum coating and film to a temperature at least sufficient to decompose the phosphoric acid.
Claim 2
Dependent Claim
141 words
A process for producing an aluminum-coated glass-ceramic cooking vessel exhibiting improved thermal durability which comprises the steps of: a. selecting a glass-ceramic vessel composed of a lithium aluminosilicate glass-ceramic material comprising a principal crystal phase consisting of beta-spodumene solid solution; b. preheating at least a selected surface portion of the glass-ceramic vessel to a temperature in the range of about 120°-600° C; c. applying to the preheated selected surface portion a molten aluminum metal spray, said spray being produced by melting an aluminum metal powder and being applied in a quantity sufficient to provide an aluminum metal coating on the vessel having a thickness in the range of about 18-28 mils; d. providing the aluminum coating with a film of phosphoric acid; and e. heating said aluminum coating and film to a temperature at least sufficient to decompose the phosphoric acid.
Claim 3
Dependent Claim
13 words
An aluminum-coated glass-ceramic cooking vessel provided according to the process of claim 1.
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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) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |