US3118712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston with reinforced piston ring grooves
Assignee: Individual
•
Filing: 1961-05-05
•
Granted: 1964-01-21
•
Expires: 1981-05-05
Abstract
No abstract record available.
Inventors
- 👤 Daub Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:06
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A PISTON COMPRISING A PISTON HEAD OF ALUMINUM OR ALUMINUM ALLOY MATERIAL AND HAVING AN OUTER SURFACE AND A PISTON RING GROOVE WITH UPPER AND LOWER PISTON RING GROOVE SURFACES, A SINGLE PIECE INSERT HAVING A CONTINUOUSLY SOLID AXIAL DIMENSION GREATER THAN THE AXIAL WIDTH OF THE GROOVE AND HARDER THAN THE PISTON HEAD MATERIAL, SAID INSERT HAVING AN INNER RING PORTION LOCATED RADIALLY INWARD FROM SAID OUTER SURFACE AND HAVING RADIALLY EXTENDING PORTIONS FORMING REINFORCING SURFACES IN SAID PISTON RING GROOVE, SAID RING PORTION HAVING AN AXIAL THICKNESS GREATER THAN THE WIDTH OF THE PISTON RING GROOVE, SAID RADIAL PORTIONS HAVING GENERAL RADIAL EXTENDING EDGE SURFACES AT AN ANGLE FACING THE PISTON RING GROOVE AND WEDGE-SHAPED PORTIONS BETWEEN SAID EDGE SURFACES AND SAID PISTON RING GROOVE TO AXIALLY LOCK SAID INSERT IN SAID PISTON HEAD.
Claim 2
Dependent Claim
136 words
A PISTON COMPRISING A PISTON HEAD OF ALUMINUM OR ALUMINUM ALLOY MATERIAL AND HAVING AN OUTER SURFACE AND A PISTON RING GROOVE WITH UPPER AND LOWER PISTON RING GROOVE SURFACES, A SINGLE PIECE INSERT HAVING A CONTINUOUSLY SOLID AXIAL DIMENSION GREATER THAN THE AXIAL WIDTH OF THE GROOVE AND HARDER THAN THE PISTON HEAD MATERIAL, SAID INSERT HAVING AN INNER RING PORTION LOCATED RADIALLY INWARD FROM SAID OUTER SURFACE AND HAVING RADIALLY EXTENDING PORTIONS FORMING REINFORCING SURFACES IN SAID PISTON RING GROOVE, SAID RING PORTION HAVING AN AXIAL THICKNESS GREATER THAN THE WIDTH OF THE PISTON RING GROOVE, SAID RADIAL PORTIONS HAVING GENERAL RADIAL EXTENDING EDGE SURFACES AT AN ANGLE FACING THE PISTON RING GROOVE AND WEDGE-SHAPED PORTIONS BETWEEN SAID EDGE SURFACES AND SAID PISTON RING GROOVE TO AXIALLY LOCK SAID INSERT IN SAID PISTON HEAD.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-20 | 1967-07-22 | 1968-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-20 | 1971-07-22 | 1972-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-20 | 1975-07-22 | 1976-01-21 | $7700.00 | Window Closed / Lapsed |