Patent US2017757A successfully refreshed from Google Patents.
US2017757A
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Duplex metal article
Assignee: Alcoa Corp
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Filing: 1933-10-20
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Granted: 1935-10-15
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Expires: 1953-10-20
Abstract
No abstract record available.
Inventors
- 👤 Keller Fred
- 👤 George F Sager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:26
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/22; B23K20/233; B23K20/2336; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12451; Y10T428/12493; Y10T428/12632; Y10T428/12736; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24917; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-10-14 | 1939-04-15 | 1939-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-10-14 | 1943-04-15 | 1943-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-10-14 | 1947-04-15 | 1947-10-15 | $7700.00 | Window Closed / Lapsed |