Patent US3765206A successfully refreshed from Google Patents.
US3765206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming coated seamless containers
Assignee: Bethlehem Steel Corp
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Filing: 1971-11-26
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Granted: 1973-10-16
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Expires: 1991-11-26
Abstract
Abstract Sheet steel having differentially coated surfaces of corrosionresistant metal for use in drawing and ironing seamless articles and the method of forming said articles including coating the opposite surfaces of the sheet steel with metallic coatings having differing lubricity, drawing the coated sheet into a preform and ironing the preform.
Inventors
- 👤 D Shah
- 👤 G Ward
- 👤 R Whiteley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:54
CPC Classifications
B; B21; B21C; B21C9/00; B21D; B21D22/00; B21D22/20; B21D22/201
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
23 words
A method of forming a coated seamless container as described in claim 1 wherein at least one of the metallic coatings is corrosion-resistant.
Claim 2
Dependent Claim
32 words
A method of forming a coated seamless container as described in claim 1 wherein the metallic coating on one side is tin and the metallic coating on the other side is tin.
Claim 3
Dependent Claim
34 words
A method of forming a coated seamless container as described in claim 1 wherein the metallic coating on said one side is chromium-chrome oxide and the metallic coating on said other side is tin.
Claim 4
Independent Claim
129 words
A method of forming a coated seamless substantially cylindrical container comprising the steps of: a. providing a sheet steel blank coated with a metallic coating on one side having a thickness of less than 0.05 lb/bb and coated on the other side with a metallic coating having a thickness between 0.10 lb/bb and 0.75 lb/bb, b. drawing said cOated blank into a cup preform by subjecting said blank to a stroke of a punch through a drawing die with the metallic coating on said one side adjacent said punch and the metallic coating on said other side adjacent said drawing die, and c. ironing said preform through a single ironing die having an entrance angle of between 4* and 6* to reduce the sidewall thickness at least 50 percent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |