US2782239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
mavity
Assignee: —
•
Filing: —
•
Granted: 1957-02-19
•
Expires: 1974-02-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:10
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/09; C07C37/00; C07C37/11; C07C37/20; C07C39/00; C07C39/02; C07C39/04; C07C46/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
85 words
THE PROCESS WHICH COMPRISES REACTING HYDROQUINONE AND METHOD IN A REACTION ZONE AT A TEMPERATURE OF FROM ABOUT 350* TO ABOUT 700*F. IN THE PRESENCE OF A FINELY DIVIDED SILICA-ALUMINA CATALYST CARRIED INTO SAID REACTION ZONE AS A SUSPENSION IN A HYDROCARBON OIL HAVING A BOILING RANGE HIGHER THEN THAT OF P-METHOXYPHENOL, WITHDRAWING REACTION PRODUCTS AND CATALYST IN COMMINGLED STATE FROM SAID REACTION ZONE, SEPARATING DIMETHYL ETHER, METHANOL AND WATER FROM OTHER REACTION PRODUCTS AND CATALYST, RECYCLING AT LEAST A PORTION OF SAID SEPARATED DIMETHYL
References Cited (Backward Citations)
US1883952A
Cited
US1966635A
Cited
US2045560A
Cited
US2067960A
Cited
US2282469A
Cited
US2564911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-19 | 1960-08-20 | 1961-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-19 | 1964-08-20 | 1965-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-19 | 1968-08-20 | 1969-02-19 | $7700.00 | Window Closed / Lapsed |