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US2384180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semisilica brick
Assignee: Bethlehem Steel Corp
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Filing: 1940-12-11
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Granted: 1945-09-04
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Expires: 1960-12-11
Abstract
No abstract record available.
Inventors
- 👤 Hobart M Kraner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:54
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-09-03 | 1949-03-05 | 1949-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-09-03 | 1953-03-05 | 1953-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-09-03 | 1957-03-05 | 1957-09-04 | $7700.00 | Window Closed / Lapsed |