US2539903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston fabrication
Assignee: AO Smith Corp
•
Filing: 1946-12-05
•
Granted: 1951-01-30
•
Expires: 1966-12-05
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Gruetjen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:18
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/002; B21; B21K; B21K1/00; B21K1/18; B21K1/185; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49249
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US167940A
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US1790664A
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US983504A
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US1279184A
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US1299655A
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US1606282A
Cited
US1835863A
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US1885463A
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US1931210A
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US2223507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |