US3349672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston for internal combustion engines
Assignee: Mahle GmbH
•
Filing: 1965-10-04
•
Granted: 1967-10-31
•
Expires: 1985-10-04
Abstract
No abstract record available.
Inventors
- 👤 Meier Alfred
- 👤 Kohl Eberhard
- 👤 Rossmann Eberhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:52
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/0015; F02F3/003; F02F3/16; F02F3/18; F02F3/20; F02F3/22; F02F3/28; F05; F05C; F05C2225/00; F05C2225/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN AN INTERNAL COMBUSTION ENGINE PISTON HAVING A PISTON HEAD OF REDUCED AREA IN THE PISTON RING ZONE, A COLLAR IN SAID ZONE, A HOLLOW CHAMBER BETWEEN SAID PISTON HEAD AND SAID COLLAR, A SEAM FORMED BETWEEN A PORTION OF SAID HEAD AND SAID COLLAR AND CHANGED PARTICLE BEAM WELD IN THE SEAM BETWEEN SAID PISTON HEAD AND SAID COLLAR, THE IMPROVEMENT COMPRISING A PROJECTION OF THE SEAM PORTION OF SAID PISTON HEAD IN THE DIRECTION OF SAID SEAM EXTENDING BEYOND SAID WELD AND INTO THE INTERIOR OF SAID CHAMBER, SAID PROJECTION HAVING SUCH A WEAK WALL AS TO EXCLUDE STRESSES THEREIN.
Claim 2
Dependent Claim
102 words
IN AN INTERNAL COMBUSTION ENGINE PISTON HAVING A PISTON HEAD OF REDUCED AREA IN THE PISTON RING ZONE, A COLLAR IN SAID ZONE, A HOLLOW CHAMBER BETWEEN SAID PISTON HEAD AND SAID COLLAR, A SEAM FORMED BETWEEN A PORTION OF SAID HEAD AND SAID COLLAR AND CHANGED PARTICLE BEAM WELD IN THE SEAM BETWEEN SAID PISTON HEAD AND SAID COLLAR, THE IMPROVEMENT COMPRISING A PROJECTION OF THE SEAM PORTION OF SAID PISTON HEAD IN THE DIRECTION OF SAID SEAM EXTENDING BEYOND SAID WELD AND INTO THE INTERIOR OF SAID CHAMBER, SAID PROJECTION HAVING SUCH A WEAK WALL AS TO EXCLUDE STRESSES THEREIN.
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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) | 1970-10-30 | 1971-05-01 | 1971-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-30 | 1975-05-01 | 1975-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-30 | 1979-05-01 | 1979-10-31 | $7700.00 | Window Closed / Lapsed |