US3773669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vessel for use in heating food in a microwave oven
Assignee: Noritake Co Ltd
•
Filing: 1972-02-22
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Granted: 1973-11-20
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Expires: 1992-02-22
Abstract
Abstract A vessel (cooking utensil) for use in heating food in a microwave oven is disclosed. This vessel is produced from a sintered body obtained by firing a mixture of ferrite powder and eucryptite powder.
Inventors
- 👤 N Yamauchi
- 👤 K Ishino
- 👤 I Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:29
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/647; H05B6/6491; H05B6/6494; A; A47; A47J; A47J36/00; A47J36/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
A vessel according to claim 1 wherein said ferrite component has a Mn-Zn component.
Claim 2
Independent Claim
83 words
A method of manufacturing a vessel for use in heating food in a microwave oven comprising firing at from about 1050*C to 1350*C for up to 3 hours a molding of a mixture of from about 40 to 80 percent by weight of ferrite powder of the formula MFe2O4 in which M is a bivalent metal selected from the group consisting of Ni, Cu, Mn, Mg, and Zn, and from about 60 to 20 percent by weight eucryptite powder of the formula LiAlSiO4.
Claim 3
Dependent Claim
19 words
A method according to claim 3 wherein said ferrite powder has a particle size of about 1 Mu .
Claim 4
Dependent Claim
19 words
A method according to claim 3 wherein said eucryptite powder has a particle size of about 10 Mu .
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |