Patent US3487594A successfully refreshed from Google Patents.
US3487594A
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Cutting tool tips and ceramics containing hafnium nitride and zirconium diboride
Assignee: Unifrax I LLC
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Filing: 1967-09-21
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Granted: 1970-01-06
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Expires: 1987-09-21
Abstract
No abstract record available.
Inventors
- 👤 Yorihiro Murata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:41
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/5805; C04B35/58064; C04B35/58078; C04B35/58007; C04B35/58028; C04B35/622; C04B35/64; C04B35/645; C22; C22C; C22C29/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2984576A
Cited
US3359216A
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US3325300A
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US3394087A
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US3409416A
Cited
US3433656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |