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US2728124A
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US
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Method of forming cylindrical shell with abrasive internal linings
Assignee: GIFFORD WOOD CO
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Filing: 1952-03-26
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Granted: 1955-12-27
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Expires: 1972-03-26
Abstract
No abstract record available.
Inventors
- 👤 Sofield David De Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:03
CPC Classifications
B; B22; B22D; B22D19/00; B22D19/08; A; A47; A47J; A47J17/00; A47J17/14; A47J17/18; B22D19/06
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) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |