US3299482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gray iron casting process and composition
Assignee: Old Carco LLC
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Filing: 1963-03-29
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Granted: 1967-01-24
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Expires: 1983-03-29
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Tache
- 👤 Robert M Cage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:58
CPC Classifications
B; B22; B22D; B22D27/00; B22D27/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
IN A CONTINUOUS PROCESS OF MAKING GRAY IRON CASTINGS NOT SUSCEPTIBLE TO SELF ANNEALING AFTER POURING IN THE MOLD, AND PRIOR TO CORE KNOCKOUT, WHERE SAID CASTING ARE SLOWLY COOLED ON A MOVING LINE SUBJECT TO STOPPAGES WHICH WOULD CAUSE SUCH SELF-ANNEALING OF THE CASTINGS AND A SOFT MATRIX IN THE WEAR AREAS OF THE CASTINGS HAVING A HARDNESS SUBSTANTIALLY BELOW 170 BRINELL AND A MICROSTRUCTURE CONTAINING IN EXCESS OF 5% UNIFORMLY DISPERSED FREE FERRITE, THE STEP WHICH ONSISTS IN ADDING TO THE MOLTEN GRAY IRON COMPOSITION PRIOR TO POURING, BETWEEN 0.04 TO 0.25% BY WEIGHT OF THE COMPOSITION OF TIN TO SUBSTANTIALLY ELIMINATE SELF ANNEALING AND TO FACILITATE THE PRODUCTION OF CASTINGS HAVING A MATRIX IN THE WEAR AREA THEREOF OF BETWEEN 170 TO 241 BRINELL HARDNESS AND A MICROSTRUCTURE OF FINE PEARLITE CONTAINING NOT MORE THAN ABOUT 5% UNIFORMLY DISPERSED FREE FERRITE, REGARDLES OF SAID LINE STOPPAGES.
Claim 2
Dependent Claim
149 words
IN A CONTINUOUS PROCESS OF MAKING GRAY IRON CASTINGS NOT SUSCEPTIBLE TO SELF ANNEALING AFTER POURING IN THE MOLD, AND PRIOR TO CORE KNOCKOUT, WHERE SAID CASTING ARE SLOWLY COOLED ON A MOVING LINE SUBJECT TO STOPPAGES WHICH WOULD CAUSE SUCH SELF-ANNEALING OF THE CASTINGS AND A SOFT MATRIX IN THE WEAR AREAS OF THE CASTINGS HAVING A HARDNESS SUBSTANTIALLY BELOW 170 BRINELL AND A MICROSTRUCTURE CONTAINING IN EXCESS OF 5% UNIFORMLY DISPERSED FREE FERRITE, THE STEP WHICH ONSISTS IN ADDING TO THE MOLTEN GRAY IRON COMPOSITION PRIOR TO POURING, BETWEEN 0.04 TO 0.25% BY WEIGHT OF THE COMPOSITION OF TIN TO SUBSTANTIALLY ELIMINATE SELF ANNEALING AND TO FACILITATE THE PRODUCTION OF CASTINGS HAVING A MATRIX IN THE WEAR AREA THEREOF OF BETWEEN 170 TO 241 BRINELL HARDNESS AND A MICROSTRUCTURE OF FINE PEARLITE CONTAINING NOT MORE THAN ABOUT 5% UNIFORMLY DISPERSED FREE FERRITE, REGARDLES OF SAID LINE STOPPAGES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |