Patent US2761885A successfully refreshed from Google Patents.
US2761885A
Expired / Lapsed
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Preparation of xylenes from condensation products of toluene and formaldehyde
Assignee: Stamicarbon BV
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Filing: 1955-02-18
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Granted: 1956-09-04
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Expires: 1975-02-18
Abstract
No abstract record available.
Inventors
- 👤 Jong Geert J De
- 👤 Koorevaar Jan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:57
CPC Classifications
C; C07; C07C; C07C4/00; C07C2521/00; C07C2521/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
60 words
A PROCESS OF PREPARING A PRODUCT CONSISTING ESSENTIALLY OF TOLUENCE AND AT LEAST ONE XYLENE FROM A CONDENSATION PRODUCT OF TOLUENCE AND FORMALDEHYDE CONSISTING ESSENTIALLY OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF DITOYL METHANE AND TOLUENE METHANE HYDROCARBONS OF HIGHER MOLECUALR WEIGHT, WHICH COMPRISES CONTACTING SAID CONDENSATION PRODUCT WITH ALUMINUM SILICATE AT A TEMPERATURE ABOVE 300* C.
Claim 2
Dependent Claim
60 words
A PROCESS OF PREPARING A PRODUCT CONSISTING ESSENTIALLY OF TOLUENCE AND AT LEAST ONE XYLENE FROM A CONDENSATION PRODUCT OF TOLUENCE AND FORMALDEHYDE CONSISTING ESSENTIALLY OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF DITOYL METHANE AND TOLUENE METHANE HYDROCARBONS OF HIGHER MOLECUALR WEIGHT, WHICH COMPRISES CONTACTING SAID CONDENSATION PRODUCT WITH ALUMINUM SILICATE AT A TEMPERATURE ABOVE 300* C.
Claim 3
Dependent Claim
70 words
A PROCESS FOR PREPARING A PRODUCT CONSISTING ESSENTIALLY OF TOLUENE AND XYLENES WHICH COMPRISES PASSING A GASEOUS MIXTURE OF DITOLYL METHANE AND STEAM IN WHICH THE AMOUNT OF STEAM IS FROM ONE TO THREE TIMES THE WEIGHT OF DITOLYL METHANE, OVER AN ALUMINUM SILICATE CATALYST AT A TEMPERATURE BETWEEN 375 AND 425* C., AND AT A RATE OF 450 TO 550 GRAMS DITOLYL METHANE PER LITER OF CATALYST PER HOUR.
Claim 4
Dependent Claim
70 words
A PROCESS FOR PREPARING A PRODUCT CONSISTING ESSENTIALLY OF TOLUENE AND XYLENES WHICH COMPRISES PASSING A GASEOUS MIXTURE OF DITOLYL METHANE AND STEAM IN WHICH THE AMOUNT OF STEAM IS FROM ONE TO THREE TIMES THE WEIGHT OF DITOLYL METHANE, OVER AN ALUMINUM SILICATE CATALYST AT A TEMPERATURE BETWEEN 375 AND 425* C., AND AT A RATE OF 450 TO 550 GRAMS DITOLYL METHANE PER LITER OF CATALYST PER HOUR.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |