Patent US3473894A successfully refreshed from Google Patents.
US3473894A
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US
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Preparation of hexagonal boron nitride
Assignee: Lonza Werke GmbH
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Filing: 1967-03-09
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Granted: 1969-10-21
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Expires: 1987-03-09
Abstract
No abstract record available.
Inventors
- 👤 Albert Babl
- 👤 Heinz Josef Geng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:42
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/40; C01; C01B; C01B21/00; C01B21/06; C01B21/064; C01B21/0645; C10M; C10M103/00; C10M125/00; C10M2201/00; C10M2201/06; C10M2201/061; C10M2201/16; C10M2201/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1157271A
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US3058809A
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US2922699A
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US3189412A
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US3261667A
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US3150929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |