US2801890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bimetallic light metal piston
Assignee: Alcan Research and Development Ltd
•
Filing: 1954-02-09
•
Granted: 1957-08-06
•
Expires: 1974-02-09
Abstract
No abstract record available.
Inventors
- 👤 Nitsch Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:31
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/02; F02F3/04; F02F3/06; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1681621A
Cited
US2062625A
Cited
US2190207A
Cited
US2177574A
Cited
US2238087A
Cited
US2271024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |