US3853612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making coated receptacle for microwave cooking of food
Assignee: OI Glass Inc
•
Filing: 1973-09-10
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Granted: 1974-12-10
•
Expires: 1993-09-10
Abstract
Abstract Disclosed is a method for selectively coating a glass-ceramic cooking receptacle with a semiconductive tin oxide coating by heating predetermined areas thereof and pyrolyzing tin oxide on said predetermined areas.
Inventors
- 👤 L Spanoudis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:23
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/245; C03C17/2453; C03C17/25; C03C17/253; H; H05; H05B; H05B6/00; H05B6/64; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/211; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/112; C03C2218/15; C03C2218/152
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
112 words
IN THE PROCESS FOR DEPOSITING A SEMICONDUCTIVE TIN OXIDE COATING ON A GLASS-CERAMIC RECEPTACLE FOR MICROWAVE COOKING WHERE A PYROLYZABLE TIN COMPOUND IS CONTACTED WITH SAID GLASS-CERAMIC RECEPTACLE AT A TEMPERATURE SUFFICIENT TO PYROLYZE SEMICONDUCTIVE TIN OXIDE THEREIN, THE IMPROVEMENT COMPRISING SELECTIVELY APPLYING HEAT TO PREDETERMINED PORTIONS OF SAID GLASS-CERAMIC RECEPTACLE TO RAISE THE TEMPERATURE OF SAID PREDETERMINED PORTIONS HAVE THE PYROLYSIS TEMPERATURE OF SAID TIN COMPOUND WHILE MAINTAINING THE TEMPERATURE OF OTHER PORTIONS OF SAID RECEPTACLE BELOW THE PYROLYSIS TEMPERATURE OF SAID TIN COMPOUND AND THEN CONTACTING THE RESULTING HEATED GLASS-CERAMIC RECEPTACLE WITH SAID TIN COMPOUND FOR A TIME SUFFICIENT TO PYROLYZE A SEMICONDUCTIVE TIN OXIDE COATING ON SAID PREDETERMINED PORTIONS.
Claim 2
Dependent Claim
112 words
IN THE PROCESS FOR DEPOSITING A SEMICONDUCTIVE TIN OXIDE COATING ON A GLASS-CERAMIC RECEPTACLE FOR MICROWAVE COOKING WHERE A PYROLYZABLE TIN COMPOUND IS CONTACTED WITH SAID GLASS-CERAMIC RECEPTACLE AT A TEMPERATURE SUFFICIENT TO PYROLYZE SEMICONDUCTIVE TIN OXIDE THEREIN, THE IMPROVEMENT COMPRISING SELECTIVELY APPLYING HEAT TO PREDETERMINED PORTIONS OF SAID GLASS-CERAMIC RECEPTACLE TO RAISE THE TEMPERATURE OF SAID PREDETERMINED PORTIONS HAVE THE PYROLYSIS TEMPERATURE OF SAID TIN COMPOUND WHILE MAINTAINING THE TEMPERATURE OF OTHER PORTIONS OF SAID RECEPTACLE BELOW THE PYROLYSIS TEMPERATURE OF SAID TIN COMPOUND AND THEN CONTACTING THE RESULTING HEATED GLASS-CERAMIC RECEPTACLE WITH SAID TIN COMPOUND FOR A TIME SUFFICIENT TO PYROLYZE A SEMICONDUCTIVE TIN OXIDE COATING ON SAID PREDETERMINED PORTIONS.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein said predetermined portions are heated to a temperature in the range of about 200*C to about 700*C.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein said predetermined portions are heated to a temperature in the range of about 300*C to about 600*C.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein said glass-ceramic receptacle has a coefficient of thermal expansion of less than about 3 X 10 6/*C (0-300*C).
Claim 6
Dependent Claim
24 words
The process of claim 1 wherein said glass-ceramic receptacle has a coefficient of thermal expansion of less than about 1 X 10 6/*C (0-300*C).
Claim 7
Dependent Claim
27 words
The process of claim 1 wherein said semiconductive tin oxide coating has a surface resistivity in the range of about 50 to about 1,000 ohms per square.
Claim 8
Dependent Claim
21 words
The process of claim 1 wherein said semiconductive tin oxide coating has a thickness of about 500 to about 10,000 angstroms.
Claim 9
Dependent Claim
27 words
The process of claim 1 wherein said semiconductive tin oxide coating has a surface resistivity in the range of about 50 to about 500 ohms per square.
Claim 10
Dependent Claim
21 words
The process of claim 1 wherein said semiconductive tin oxide coating has a thickness of about 1,000 to about 7,000 angstroms.
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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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |