US2720968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlocking ingots
Assignee: Alcan Research and Development Ltd
•
Filing: 1952-12-31
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Granted: 1955-10-18
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Expires: 1972-12-31
Abstract
No abstract record available.
Inventors
- 👤 Mcfall Stanley Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:44
CPC Classifications
B; B22; B22D; B22D5/00; B22D5/005; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12306
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) | 1958-10-17 | 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 |