Patent US3108121A successfully refreshed from Google Patents.
US3108121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of dibenzofuran
Assignee: —
•
Filing: —
•
Granted: 1963-10-22
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Expires: 1980-10-22
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:43
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
A PROCESS FOR THE PREPARATION OF DIBENZOFURAN WHICH COMPRISES CONTACTING DIPHENYL OXIDE IN THE VAPOR PHASE WITH A CATALYST CONSISTING OF PLATINUM OF CHARCOAL.
Claim 2
Dependent Claim
24 words
A PROCESS FOR THE PREPARATION OF DIBENZOFURAN WHICH COMPRISES CONTACTING DIPHENYL OXIDE IN THE VAPOR PHASE WITH A CATALYST CONSISTING OF PLATINUM OF CHARCOAL.
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) | 1966-10-21 | 1967-04-22 | 1967-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-21 | 1971-04-22 | 1971-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-21 | 1975-04-22 | 1975-10-22 | $7700.00 | Window Closed / Lapsed |