Patent US3634579A successfully refreshed from Google Patents.
US3634579A
Expired / Lapsed
US
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Method of manufacture of container and closure
Assignee: Borg Warner Corp
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Filing: 1969-08-25
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Granted: 1972-01-11
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Expires: 1989-08-25
Abstract
Abstract A container and closure, or similar articles, are cold formed from thermoplastic sheet material using a combination forming and edge curling die. A convoluted curl, i.e. one in which the edge is completely rolled under the primary curl, is produced in a die set having curling grooves in both the upper and lower draw rings. During the return stroke of the forming operations, a primary curl is formed and, is the lower and upper draw rings travel relative to the punch, a secondary curl is formed to provide a convoluted edge.
Inventors
- 👤 Walter F Matras
- 👤 William R Meadors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:44
CPC Classifications
B; B29; B29C; B29C57/00; B29C57/12; B21; B21D; B21D19/00; B21D19/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |