Patent US2996792A successfully refreshed from Google Patents.
US2996792A
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Methods for producing hollow metallic sheets
Assignee: Alcan Research and Development Ltd
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Filing: 1957-10-15
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Granted: 1961-08-22
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Expires: 1977-10-15
Abstract
No abstract record available.
Inventors
- 👤 Mackie Alastair Munro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:03
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/224; B21; B21D; B21D53/00; B21D53/02; B21D53/04; B21D53/045; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366; Y10T29/49369; Y10T29/4998; Y10T29/49988; Y10T29/49991
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US29276A
Cited
US866140A
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US1788145A
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US2191788A
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US2375334A
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US2775028A
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US2756496A
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US2766514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |