US2720967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlocking ingots
Assignee: Alcan Research and Development Ltd
•
Filing: 1952-12-31
•
Granted: 1955-10-18
•
Expires: 1972-12-31
Abstract
No abstract record available.
Inventors
- 👤 Wilson William Georg Macdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:24
CPC Classifications
B; B22; B22D; B22D5/00; B22D5/005; B65; B65D; B65D71/00; B65D71/02; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12229; Y10T428/12264
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US110143A
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US114188A
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US186836A
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US475969A
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US674093A
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US952259A
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US1231897A
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US1758903A
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US2119112A
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US2201110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |