Patent US3087842A successfully refreshed from Google Patents.
US3087842A
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Method for the manufacture of piston rings
Assignee: Fundiciones Industriales SA
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Filing: 1960-01-21
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Granted: 1963-04-30
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Expires: 1980-01-21
Abstract
No abstract record available.
Inventors
- 👤 Borras Jose Nadal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:22
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49274; Y10T29/49284
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A METHOD OF CASTING PISTON RINGS, COMPRISING IN COMBINATION THE STEPS OF PREPARING AN ALLOY CONTAINING BY WEIGHT CARBON 3.3%; MANGANESE 0.5%; SULFUR 0.05%; SILICON AT MOST 3%, CHROMIUM AT LEAST 0.6%, MOLYBDENUM AT LEAST 0.6%, PHOSPHORUS AT MOST 0.5%, THE REST BEING IRON; CASTING SAID ALLOY TO FORM A RING THE STRUCTURE OF WHICH IS WITHIN THE RANGE CONSISTING OF A MATRIX OF A FINE PEARLITE AND DISSEMINATION OF CARBIDES AND FINES GRAPHITE, THE HARDNESS OF THE RING BEING 107 TO 113 ROCKWELL B; THEN HEATING THE RING AT A TEMPERATURE OF BETWEEN 900*C. AND 950*C. FOR A TIME PERIOD RANGING BETWEEN ONE TO THREE HOURS AND QUENCHING THE RING IN OIL TO PROVIDE A HARDENED RING HAVING A STRUCTURE OF A MATRIX OF FINE MARTENSITE AND A HARDNESS OF AT LEAST 52 ROCKWELL C; THEN TEMPERATING THE HARDENED RING AT A TEMPERATURE OF BETWEEN 250* C. AND 350*C. TO FORM A RING STRUCTURE CONSISTING
Claim 2
Independent Claim
156 words
A METHOD OF CASTING PISTON RINGS, COMPRISING IN COMBINATION THE STEPS OF PREPARING AN ALLOY CONTAINING BY WEIGHT CARBON 3.3%; MANGANESE 0.5%; SULFUR 0.05%; SILICON AT MOST 3%, CHROMIUM AT LEAST 0.6%, MOLYBDENUM AT LEAST 0.6%, PHOSPHORUS AT MOST 0.5%, THE REST BEING IRON; CASTING SAID ALLOY TO FORM A RING THE STRUCTURE OF WHICH IS WITHIN THE RANGE CONSISTING OF A MATRIX OF A FINE PEARLITE AND DISSEMINATION OF CARBIDES AND FINES GRAPHITE, THE HARDNESS OF THE RING BEING 107 TO 113 ROCKWELL B; THEN HEATING THE RING AT A TEMPERATURE OF BETWEEN 900*C. AND 950*C. FOR A TIME PERIOD RANGING BETWEEN ONE TO THREE HOURS AND QUENCHING THE RING IN OIL TO PROVIDE A HARDENED RING HAVING A STRUCTURE OF A MATRIX OF FINE MARTENSITE AND A HARDNESS OF AT LEAST 52 ROCKWELL C; THEN TEMPERATING THE HARDENED RING AT A TEMPERATURE OF BETWEEN 250* C. AND 350*C. TO FORM A RING STRUCTURE CONSISTING
References Cited (Backward Citations)
US1284439A
Cited
US1380136A
Cited
US1951646A
Cited
US2027116A
Cited
GB467159A
Cited
US2181947A
Cited
US2417610A
Cited
US2811762A
Cited
US2895859A
Cited
US2763545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |