US2964573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dichloromethylation of xylenes
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1958-10-09
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Granted: 1960-12-13
•
Expires: 1978-10-09
Abstract
No abstract record available.
Inventors
- 👤 Jr William G De Pierri
- 👤 Harold W Earhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:25
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26; C07C17/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A METHOD FOR THE DICHLOROMETHYLATION OF A XYLENE WHICH COMPRISES CONTACTING SAID XYLENE WITH ABOUT 12 TO 15 MOLS OF HYDROCHLORIC ACID, ABOUT 1.5 TO 2.5 MOLS OF ZINC CHLORIDE, ABOUT 4.5 TO 5.5 MOLS OF FORMALDEHYDE, AND ABOUT 55 TO 65 MOLS OF WATER PER MOL OF XYLENE AT A TEMPERATURE OF ABOUT 90* OF 100*C. FOR A REACTION TIME WITHIN THE RANGE OF ABOUT 1 TO 3 HOURS AND THEREAFTER RECOVERING A DICHLOROMETHYL XYLENE FROM SAID PRODUCT.
Claim 2
Independent Claim
79 words
A METHOD FOR THE DICHLOROMETHYLATION OF A XYLENE WHICH COMPRISES CONTACTING SAID XYLENE WITH ABOUT 12 TO 15 MOLS OF HYDROCHLORIC ACID, ABOUT 1.5 TO 2.5 MOLS OF ZINC CHLORIDE, ABOUT 4.5 TO 5.5 MOLS OF FORMALDEHYDE, AND ABOUT 55 TO 65 MOLS OF WATER PER MOL OF XYLENE AT A TEMPERATURE OF ABOUT 90* OF 100*C. FOR A REACTION TIME WITHIN THE RANGE OF ABOUT 1 TO 3 HOURS AND THEREAFTER RECOVERING A DICHLOROMETHYL XYLENE FROM SAID PRODUCT.
References Cited (Backward Citations)
US2469334A
Cited
US2862980A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |