Patent US3504513A successfully refreshed from Google Patents.
US3504513A
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US
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Apparatus for scoring a tube for lining
Assignee: Copperweld Steel Co
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Filing: 1967-08-11
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Granted: 1970-04-07
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Expires: 1987-08-11
Abstract
No abstract record available.
Inventors
- 👤 Otis J Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:33
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/30; B29; B29C; B29C63/00; B29C63/48; Y; Y10; Y10S; Y10S72/00; Y10S72/703; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49909; Y10T29/49911
Claims Analysis
Total Claims: 0
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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) | 1973-04-06 | 1973-10-06 | 1974-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-06 | 1977-10-06 | 1978-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-06 | 1981-10-06 | 1982-04-07 | $7700.00 | Window Closed / Lapsed |