US3450574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating refractory wares with magnesia
Assignee: Nortel Networks Ltd
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Filing: 1966-11-14
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Granted: 1969-06-17
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Expires: 1986-11-14
Abstract
No abstract record available.
Inventors
- 👤 Phillip J Read
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:04
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/14; C23C14/16; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B41/00; C04B41/009; C04B41/45; C04B41/4505; C04B41/50; C04B41/5025; C04B41/5029; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C23C14/58; C23C14/5806; C23C14/5846; C23C14/586
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A METHOD OF APPLYING A THIN LAYER OF MAGNESIA TO A REFRACTORY WARE WHICH COMPRISES APPLYING A THIN FILM OF MAGNESIUM METAL ONTO A REFRACTORY WARE, HEATING THE THUS COATED WARE IN A FURNACE IN A NITROGEN ATMOSPHERE TO A TEMPERATURE IN THE RANGE OF ABOUT 900 TO ABOUT 1200*C. TO CONVERT THE COATING TO A MIXTURE OF MAGNESIUM AND THE NITRIDE THEREOF, AND THEREAFTER QUICKLY CHANGING THE ATMOSPHERE IN THE FURNACE TO OXYGEN TO CAUSE A STRONGLY EXOTHERMIC REACTION WHICH EVOLVES SUFFICIENT HEAT IN THE COATING TO SINTER THE COATING TO THE WARE.
Claim 2
Independent Claim
94 words
A METHOD OF APPLYING A THIN LAYER OF MAGNESIA TO A REFRACTORY WARE WHICH COMPRISES APPLYING A THIN FILM OF MAGNESIUM METAL ONTO A REFRACTORY WARE, HEATING THE THUS COATED WARE IN A FURNACE IN A NITROGEN ATMOSPHERE TO A TEMPERATURE IN THE RANGE OF ABOUT 900 TO ABOUT 1200*C. TO CONVERT THE COATING TO A MIXTURE OF MAGNESIUM AND THE NITRIDE THEREOF, AND THEREAFTER QUICKLY CHANGING THE ATMOSPHERE IN THE FURNACE TO OXYGEN TO CAUSE A STRONGLY EXOTHERMIC REACTION WHICH EVOLVES SUFFICIENT HEAT IN THE COATING TO SINTER THE COATING TO THE WARE.
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) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |