Patent US2797173A successfully refreshed from Google Patents.
US2797173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for annealing and coating steel sheets
Assignee: Individual
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Filing: 1954-05-06
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Granted: 1957-06-25
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Expires: 1974-05-06
Abstract
No abstract record available.
Inventors
- 👤 John D Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:28
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/34; C21D1/44; C21D1/48; C23; C23C; C23C2/00; C23C2/003; C23C2/0034; C23C2/00342; C23C2/00344; C23C2/0035; C23C2/0038; C23C2/004; C23C2/02; C23C2/022; C23C2/0224; C23C2/024; B; B21; B21B; B21B1/00; B21B1/22; B21B2001/228; B21B1/38; B21B2001/383; B21B27/00; B21B27/06; B21B27/10; B21B27/106; B21B45/00; B21B45/004; B21B9/00; Y; Y02; Y02P; Y02P70/00; Y02P70/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
THE METHOD OF HEAT TREATING AND GALVANIZING FERROUS METAL SHEET OR STRIP WHICH COMPRISES THE STEPS OF PASSING THE STRIP CONTINUOUSLY THROUGH A LIQUID BATH OF ALKALI METALS OF INCREASING TEMPERATURE RANGE HAVING THE PROPERTIES OF REMOVING IRON OXIDE AND IMPURITIES FROM THE SURFACE OF THE STRIP, RETURNING THE STRIP FROM THE HIGH TO THE INITIAL LOW TEMPERATURE ZONE OF THE BATH TO COOL SAID STRIP TO A TEMPERATURE APPROXIMATING THE GALVANIZING TEMPERATURE OF MOLTEN ZINC AND PASSING THE STRIP CONTINUOUSLY THROUGH A NON-OXIDIZING SUBSTANCE INTO AND THROUGH A BATH OF MOLTEN ZINC.
Claim 2
Independent Claim
93 words
THE METHOD OF HEAT TREATING AND GALVANIZING FERROUS METAL SHEET OR STRIP WHICH COMPRISES THE STEPS OF PASSING THE STRIP CONTINUOUSLY THROUGH A LIQUID BATH OF ALKALI METALS OF INCREASING TEMPERATURE RANGE HAVING THE PROPERTIES OF REMOVING IRON OXIDE AND IMPURITIES FROM THE SURFACE OF THE STRIP, RETURNING THE STRIP FROM THE HIGH TO THE INITIAL LOW TEMPERATURE ZONE OF THE BATH TO COOL SAID STRIP TO A TEMPERATURE APPROXIMATING THE GALVANIZING TEMPERATURE OF MOLTEN ZINC AND PASSING THE STRIP CONTINUOUSLY THROUGH A NON-OXIDIZING SUBSTANCE INTO AND THROUGH A BATH OF MOLTEN ZINC.
References Cited (Backward Citations)
US1916407A
Cited
US2023904A
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US2110893A
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US2231009A
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US2359095A
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US2428523A
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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 |