US2741827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of piston rings by powder metallurgy and articles obtained thereby
Assignee: AUGUST H SCHILLING
•
Filing: 1950-12-22
•
Granted: 1956-04-17
•
Expires: 1970-12-22
Abstract
No abstract record available.
Inventors
- 👤 Koehler Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:25
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; Y; Y10; Y10S; Y10S75/00; Y10S75/95; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49274
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
IN A PROCESS FOR THE MANUFACTURE OF PISTON RINGS BY POWDER METALLURGH AND SUITABLE FOR USE IN HIGH SPEED INTERNAL COMBUSTION ENGINES, THE STEPS WHICH INCLUDE PRESSING A MIXTURE COMPRISING A PREPONDERATING PROPORTION OF IRON POWDER, ABOUT 1 TO 10% OF LEAD POWDER, AND A SMALL PROPORTION OF GRAPHITE TO APPROXIMATELY THE DESIRED SHAPE, SINTERING THE MASS, AND SUBSEQUENTLY HOT-PRESSING THE SAME.
Claim 2
Dependent Claim
62 words
IN A PROCESS FOR THE MANUFACTURE OF PISTON RINGS BY POWDER METALLURGH AND SUITABLE FOR USE IN HIGH SPEED INTERNAL COMBUSTION ENGINES, THE STEPS WHICH INCLUDE PRESSING A MIXTURE COMPRISING A PREPONDERATING PROPORTION OF IRON POWDER, ABOUT 1 TO 10% OF LEAD POWDER, AND A SMALL PROPORTION OF GRAPHITE TO APPROXIMATELY THE DESIRED SHAPE, SINTERING THE MASS, AND SUBSEQUENTLY HOT-PRESSING THE SAME.
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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) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |