Patent US3149130A successfully refreshed from Google Patents.
US3149130A
Expired / Lapsed
US
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Process for preparing 2, 3-dihydropara-dioxin
Assignee: Union Carbide Corp
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Filing: 1960-05-13
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Granted: 1964-09-15
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Expires: 1980-05-13
Abstract
No abstract record available.
Inventors
- 👤 Howard R Guest
- 👤 Ben W Kiff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:03
CPC Classifications
C; C07; C07D; C07D319/00; C07D319/10; C07D319/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
A PROCESS FOR PRODUCING 2,3-DIHYDOR-PARA-DIOXIN WHICH COMPRISES CONTACTING ETHYLENE GLYCOL VAPOR WITH AN OXIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF PLATINUM, PALLADIUM, RHODIUM AND RUTHENIUM AS CATALYST.
Claim 2
Dependent Claim
30 words
A PROCESS FOR PRODUCING 2,3-DIHYDOR-PARA-DIOXIN WHICH COMPRISES CONTACTING ETHYLENE GLYCOL VAPOR WITH AN OXIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF PLATINUM, PALLADIUM, RHODIUM AND RUTHENIUM AS CATALYST.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |