Patent US436420A successfully refreshed from Google Patents.
US801296A
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Process for the production of molded blocks of silicon carbid.
Assignee: CHEMISCH-ELECTRISCHE FABRIK PROMETHEUS G M B H
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Filing: 1905-03-14
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Granted: 1905-10-10
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Expires: 1925-03-14
Abstract
No abstract record available.
Inventors
- 👤 Friedrich Boelling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:49
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/991; C01B32/956; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565
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) | 1908-10-09 | 1909-04-10 | 1909-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1912-10-09 | 1913-04-10 | 1913-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1916-10-09 | 1917-04-10 | 1917-10-10 | $7700.00 | Window Closed / Lapsed |