US2842471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder metallurgy and piston rings obtained thereby
Assignee: AUGUST H SCHILLING
•
Filing: 1956-04-02
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Granted: 1958-07-08
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Expires: 1976-04-02
Abstract
No abstract record available.
Inventors
- 👤 Koehler Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:06
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
PROCESS FOR THE MANUFACTURE OF PISTON RINGS SUITABLE FOR USE IN HIGH SPEED INTERNAL COMBUSTION ENGINES, THE STEPS WHICH COMPRISE PRESSING A MIXTURE OF A PREPONDERATING PROPORTION OF IRON POWDER, ABOUT 1 TO 10% OF LEAD POWDER, AND A SMALL PROPORTION OF POWDERED GRAPHITE TO APPROXIMATELY THE DESIRED SHAPE, SINTERING THE MASS, SUBSEQUENTLY COLD-PRESSING THE SAME, AND THEREAFTER REHEATING THE PRESSED MASS.
Claim 2
Dependent Claim
62 words
PROCESS FOR THE MANUFACTURE OF PISTON RINGS SUITABLE FOR USE IN HIGH SPEED INTERNAL COMBUSTION ENGINES, THE STEPS WHICH COMPRISE PRESSING A MIXTURE OF A PREPONDERATING PROPORTION OF IRON POWDER, ABOUT 1 TO 10% OF LEAD POWDER, AND A SMALL PROPORTION OF POWDERED GRAPHITE TO APPROXIMATELY THE DESIRED SHAPE, SINTERING THE MASS, SUBSEQUENTLY COLD-PRESSING THE SAME, AND THEREAFTER REHEATING THE PRESSED MASS.
References Cited (Backward Citations)
US2491238A
Cited
US2741827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-07 | 1962-01-06 | 1962-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-07 | 1966-01-06 | 1966-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-07 | 1970-01-06 | 1970-07-08 | $7700.00 | Window Closed / Lapsed |