Patent US3348918A successfully refreshed from Google Patents.
US3348918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamond purification
Assignee: EIDP Inc
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Filing: 1966-11-21
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Granted: 1967-10-24
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Expires: 1986-11-21
Abstract
No abstract record available.
Inventors
- 👤 Jurgen M Kruse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:26
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A PROCESS FOR SELECTIVELY OXIDIZING THE CARBON IN A CARBON-DIAMOND POWDER MIXTURE WHICH COMPRISES CONTACTING SAID MIXTURE WITH A LEAD OXIDE AND MOLECULAR OXYGEN AT A TEMPERATURE WITHIN THE RANGE OF ABOUT FROM 250 TO 500*C.
Claim 2
Dependent Claim
36 words
A PROCESS FOR SELECTIVELY OXIDIZING THE CARBON IN A CARBON-DIAMOND POWDER MIXTURE WHICH COMPRISES CONTACTING SAID MIXTURE WITH A LEAD OXIDE AND MOLECULAR OXYGEN AT A TEMPERATURE WITHIN THE RANGE OF ABOUT FROM 250 TO 500*C.
References Cited (Backward Citations)
US3030187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |