Patent US1937028A successfully refreshed from Google Patents.
US1937028A
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US
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Method and apparatus for making refractory bricks
Assignee: Koppers Co of Delaware
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Filing: 1931-04-17
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Granted: 1933-11-28
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Expires: 1951-04-17
Abstract
No abstract record available.
Inventors
- 👤 Lux Elisabeth
- 👤 Daniels Wilhelm Heinrich
- 👤 Kuhn Eberhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:55
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/08; B28B1/093; B28B3/00; B28B3/02; B28B3/022
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) | 1936-11-27 | 1937-05-29 | 1937-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-11-27 | 1941-05-29 | 1941-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-11-27 | 1945-05-29 | 1945-11-28 | $7700.00 | Window Closed / Lapsed |