Patent US2903759A successfully refreshed from Google Patents.
US2903759A
Expired / Lapsed
US
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Casting of refractory metals
Assignee: Individual
•
Filing: 1954-07-06
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Granted: 1959-09-15
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Expires: 1974-07-06
Abstract
No abstract record available.
Inventors
- 👤 Helen E Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:15
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1295; B; B22; B22D; B22D11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2557971A
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US2660770A
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US2631344A
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US2682692A
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US2716790A
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US2709842A
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US2672661A
Cited
US2803046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |