US2680085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of maintaining dimensional tolerances in partially enameled metal objects
Assignee: AO Smith Corp
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Filing: 1949-10-26
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Granted: 1954-06-01
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Expires: 1969-10-26
Abstract
No abstract record available.
Inventors
- 👤 Jr Arthur Edward Raeuber
- 👤 James D Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:55
CPC Classifications
C; C23; C23D; C23D5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
THE METHOD OF MAINTAINING DIMENSIONAL TOLERANCES IN A FERROUS METAL ARTICLE HAVING A VITREOUS ENAMEL COATING APPLIED TO A PORTION OF THE ARTICLE WHICH COMPRISES PROVIDING AN OXIDE BOND BETWEEN THE METAL AND THE ENAMEL BY HEATING THE SAME IN AN OXIDIZING ATMOSPHERE AT ABOUT 1050* F., CHANGING SAID ATMOSPHERE TO A REDUCING ATMOSPHERE WHILE GRADUALLY RAISING THE TEMPERATURE TO SUBSTANTIALLY 1600* F. TO FUSE AND BOND THE ENAMEL TO THE METAL AND THEREAFTER PERMITTING THE PARTIALLY COATED ARTICLE TO COOL TO SUBSTANTIALLY 300* F. IN SAID LAST NAMED ATMOSPHERE.
Claim 2
Independent Claim
90 words
THE METHOD OF MAINTAINING DIMENSIONAL TOLERANCES IN A FERROUS METAL ARTICLE HAVING A VITREOUS ENAMEL COATING APPLIED TO A PORTION OF THE ARTICLE WHICH COMPRISES PROVIDING AN OXIDE BOND BETWEEN THE METAL AND THE ENAMEL BY HEATING THE SAME IN AN OXIDIZING ATMOSPHERE AT ABOUT 1050* F., CHANGING SAID ATMOSPHERE TO A REDUCING ATMOSPHERE WHILE GRADUALLY RAISING THE TEMPERATURE TO SUBSTANTIALLY 1600* F. TO FUSE AND BOND THE ENAMEL TO THE METAL AND THEREAFTER PERMITTING THE PARTIALLY COATED ARTICLE TO COOL TO SUBSTANTIALLY 300* F. IN SAID LAST NAMED ATMOSPHERE.
References Cited (Backward Citations)
US1156170A
Cited
US2109487A
Cited
US2001725A
Cited
US1996840A
Cited
US2004632A
Cited
US2070368A
Cited
US2110893A
Cited
US2199804A
Cited
US2354123A
Cited
US2442485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |