US3616729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston cooling for internal combustion engine
Assignee: MAN AG
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Filing: 1969-12-02
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Granted: 1971-11-02
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Expires: 1989-12-02
Abstract
Abstract A PISTON HAVING A COMBUSTION CHAMBER SURROUNDED BY AN INNER COOLING CHAMBER PARTIALLY FILLED WITH A COOLANT SOLID AT LOWER TEMPERATURES BUT MELTED AT THE OPERATING TEMPERATURE FOR THE PISTON IN WHICH THE INNER COOLING SPACES ARE SEGMENTED TO PROVIDE SYMMETRICAL DISPOSITION OF THE COOLANT WHEN THE PISTON IS USED IN A SLOPING POSITION, AND ALSO TO PROVIDE FOR USE OF COOLANTS OF DIFFERENT MELTING POINTS IN ONE OR MORE SEGMENTS OF THE INNER COOLING CHAMBER TO COMPENSATE FOR UNEQUAL HEATING OF THE COMBUSTION CHAMBER WALLS.
Inventors
- 👤 Hans Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:32
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/10; F02F3/12; F02F3/14; F02F3/16; F02F3/18
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |