Patent US3501289A successfully refreshed from Google Patents.
US3501289A
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US
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Method and apparatus for adding heat to molten metal under vacuum
Assignee: Finkl A and Sons Co
•
Filing: 1965-06-09
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Granted: 1970-03-17
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Expires: 1985-06-09
Abstract
No abstract record available.
Inventors
- 👤 C W Finkl
- 👤 Herbert S Philbrick Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:07
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA602449A
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CA613372A
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US963652A
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GB812216A
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US2929704A
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US3024102A
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US2882570A
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US2893860A
Cited
US3033550A
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GB871659A
Cited
US3236636A
Cited
US3224869A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |