US3679513A
Expired / Lapsed
US
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Process for applying a polymeric film to a steel substrate
Assignee: Steel Company of Canada Ltd
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Filing: 1970-05-06
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Granted: 1972-07-25
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Expires: 1990-05-06
Abstract
Abstract A METHOD OF APPLYING A FILM OF LOWER POLYOLEFIN OR FIM OF A COPOLYMER OF A MAJOR AMOUNT OF A LOWER OLEFIN WITH A MINOR AMOUNT OF A COPOLYMERIZABLE MONOMER HAVING POLAR FUNCTIONAL GROUPS TO A STEEL SUBSTRATE WHICH INVOLVES GENERATION OF AN INTERMEDIATE LAYER OF CHROMIUM/CHROMIUM OXIDE ON THE SUBSTRATE AND THEN APPLICATION OF THE POLYOLEFIN FILM DURING A PRE-DETERMINED HEATING CYCLE IS DESCRIBED. THE METHOD PERMITS HIGH LINE SPEEDS IN A CONTINUOUS PROCESS. THE PRODUCT EXHIBITS EXCELLENT RESISTANCE TO CORROSION AND DELAMINATION.
Inventors
- 👤 Ramon L Addinall
- 👤 William T Lewis
- 👤 Otokar Mudroch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:44
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/085; B32B15/18; B32B27/00; B32B27/32; B32B27/322; B32B37/00; B32B37/14; B32B37/16; B32B37/20; B32B37/203; B32B37/206; B32B2255/00; B32B2255/06; B32B2255/20; B32B2255/205; B32B2307/00; B32B2307/70; B32B2307/714; B32B2310/00; B32B2310/08; B32B2310/0806; B32B2310/0812; B32B2311/00; B32B2311/30; B32B2323/00; B32B2323/04; B32B2327/00; B32B2327/12; B32B2327/18; B32B2439/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |