Patent US2621916A successfully refreshed from Google Patents.
US2621916A
Expired / Lapsed
US
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Crucible or melting pot
Assignee: WILLIAM L WILBERT
•
Filing: 1949-12-19
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Granted: 1952-12-16
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Expires: 1969-12-19
Abstract
No abstract record available.
Inventors
- 👤 David Z Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:12
CPC Classifications
F; F27; F27B; F27B14/00; F27B14/08; F27B14/10; F27B2014/0875
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US307845A
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US1995593A
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US2054922A
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US2464714A
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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) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |