US2807247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston head for internal combustion engines
Assignee: Nordberg Manufacturing Co
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Filing: 1955-08-03
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Granted: 1957-09-24
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Expires: 1975-08-03
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert Cramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:16
CPC Classifications
F; F01; F01P; F01P3/00; F01P3/06; F01P3/10
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) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |