Patent US3421886A successfully refreshed from Google Patents.
US3421886A
Expired / Lapsed
US
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Cast iron with at least 50% of the graphite in vermicular form and a process for making same
Assignee: Huntington Alloys Corp
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Filing: 1968-03-13
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Granted: 1969-01-14
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Expires: 1988-03-13
Abstract
No abstract record available.
Inventors
- 👤 Robert Douglas Schelleng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:15
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/10; C21C1/08; C22; C22C; C22C37/00; C22C37/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2749238A
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US2542655A
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US2841489A
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US2841488A
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US2841490A
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US2877111A
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US2867555A
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US2873188A
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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) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |