US3521874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas diffuser unit for use in treating molten metal
Assignee: Reynolds Metals Co
•
Filing: 1967-05-12
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Granted: 1970-07-28
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Expires: 1987-05-12
Abstract
No abstract record available.
Inventors
- 👤 Eugene L Warfield
- 👤 Charles M Thompson
- 👤 Gordon C Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:32
CPC Classifications
B; B22; B22D; B22D1/00; B22D1/002; B22D1/005; C; C22; C22B; C22B21/00; C22B21/06; C22B21/064; C22B9/00; C22B9/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US67350A
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US1836196A
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US2540231A
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US2871008A
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US2874038A
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US2975047A
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FR1386390A
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US3380727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |