Patent US331023A successfully refreshed from Google Patents.
Patent US2797177A successfully refreshed from Google Patents.
US2797177A
Expired / Lapsed
US
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Method of and apparatus for annealing strip steel
Assignee: Individual
•
Filing: 1953-01-14
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Granted: 1957-06-25
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Expires: 1973-01-14
Abstract
No abstract record available.
Inventors
- 👤 John D Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:57
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/56; C21D9/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
THE METHOD OF HEAT-TREATING RELATIVELY THIN FERROUS METAL BODIES WHICH COMPRISES FEEDING THE SAME INTO A LIQUID BATH OF SODIUM OF CONSTANT COMPOSITION THROUGHOUT HAVING A RELATIVELY LOW MELTING POINT AND A HIGH BOILING POINT, SAID BATH HAVING GRADUALLY INCREASING TEMPERATURE ZONES TO HEAT THE METAL UNIFORMLY TO A SUITABLE ANNEALING TEMPERATURE AND WITHDRAWING THE FERROUS METAL THROUGH SAID BATH TO A POINT OF EXIT AT LEAST PART WAY.
Claim 2
Independent Claim
69 words
THE METHOD OF HEAT-TREATING RELATIVELY THIN FERROUS METAL BODIES WHICH COMPRISES FEEDING THE SAME INTO A LIQUID BATH OF SODIUM OF CONSTANT COMPOSITION THROUGHOUT HAVING A RELATIVELY LOW MELTING POINT AND A HIGH BOILING POINT, SAID BATH HAVING GRADUALLY INCREASING TEMPERATURE ZONES TO HEAT THE METAL UNIFORMLY TO A SUITABLE ANNEALING TEMPERATURE AND WITHDRAWING THE FERROUS METAL THROUGH SAID BATH TO A POINT OF EXIT AT LEAST PART WAY.
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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) | 1960-06-24 | 1960-12-24 | 1961-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-24 | 1964-12-24 | 1965-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-24 | 1968-12-24 | 1969-06-25 | $7700.00 | Window Closed / Lapsed |