US3214820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steel foil and manufacture
Assignee: National Steel Corp
•
Filing: 1963-02-08
•
Granted: 1965-11-02
•
Expires: 1983-02-08
Abstract
No abstract record available.
Inventors
- 👤 Edwin J Smith
- 👤 Edward P Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:09
CPC Classifications
B; B21; B21B; B21B1/00; B21B1/38; B23; B23K; B23K20/00; B23K20/04; B23K20/22; B23K20/227; B32; B32B; B32B15/00; B32B15/01; B32B15/013; B32B15/04; B32B15/08; C; C21; C21D; C21D8/00; C21D8/02; C21D8/0278; D; D21; D21H; D21H19/00; D21H19/02; D21H19/04; C21D2251/00; C21D8/0221; C21D8/0236; Y; Y10; Y10T; Y10T29/00; Y10T29/30; Y10T29/301; Y10T29/302
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
METHOD FOR PRODUCING METAL PLATED, NON-EMBRITTLED, STEEL FOIL COMPRISING APPLYING AN IRON-ALLOY-LAYER FREE METALLIC COATING TO STRIP STEEL, THE STRIP STEEL HAVING A THICKNESS GAGE BETWEEN ABOUT .003" AND ABOUT .065" AND A CARBON CONTENT UP TO ABOUT .15%, AND COLD REDUCING THE METAL COATED STRIP STEEL AT LEAST 70%, WITHOUT ANNEALING THE STEEL DURING THE COLD REDUCING, BY COLD ROLLING TO A THICKNESS GAGE BETWEEN ABOUT .0001" AND ABOUT .002".
Claim 2
Dependent Claim
71 words
METHOD FOR PRODUCING METAL PLATED, NON-EMBRITTLED, STEEL FOIL COMPRISING APPLYING AN IRON-ALLOY-LAYER FREE METALLIC COATING TO STRIP STEEL, THE STRIP STEEL HAVING A THICKNESS GAGE BETWEEN ABOUT .003" AND ABOUT .065" AND A CARBON CONTENT UP TO ABOUT .15%, AND COLD REDUCING THE METAL COATED STRIP STEEL AT LEAST 70%, WITHOUT ANNEALING THE STEEL DURING THE COLD REDUCING, BY COLD ROLLING TO A THICKNESS GAGE BETWEEN ABOUT .0001" AND ABOUT .002".
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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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |