US2806883A
Expired / Lapsed
US
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Durene dialdehyde and its preparation
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1954-07-30
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Granted: 1957-09-17
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Expires: 1974-07-30
Abstract
No abstract record available.
Inventors
- 👤 Louis A Mikeska
- 👤 Donald F Koenecke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:56
CPC Classifications
C; C07; C07C; C07C47/00; C07C47/52; C07C47/544; C07C45/00; C07C45/27; C07C45/29; C07C47/542
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
3 words
2,3,5,6-TETRAMETHYL TEREPHTHALYL DIALDEHYDE.
Claim 2
Dependent Claim
3 words
2,3,5,6-TETRAMETHYL TEREPHTHALYL DIALDEHYDE.
Claim 3
Dependent Claim
111 words
A PROCESS FOR MAKING A DIALDEHYDE WHICH COMPRISES MIXING A 1,4-DIHYDROXYMETHYLATED BENZENE HYDROCARBON WITH ABOUT 0.1 TO 0.5 MOLE EQUIVALENTS OF AN ALKALI METAL HYDROXIDE AND ABOUT 1.1 TO 2 MOL EQUIVALENT OF A MONONITRATED HYDROCARBON OF THE CLASS CONSISTING OF BENZENE, TOLUENE, XYLENE AND NAPHTHALENE, ALSO ADDING TO THE REACTION MIXTURE ABOUT 2 TO 4 VOLUMES OF A WATERIMMISCIBLE INERT ENTRAINING AGENT HAVING A BOILING POINT BETWEEN ABOUT 50* AND ABOUT 150*C., HEATING THE RESULTING MIXTURE AT A TEMPERATURE BETWEEN ABOUT 100* AND 300*C. AND SUFFICIENT TO VAPORIZE THE ENTRAINER, WITHDRAWING VAPORIZED ENTRAINER AND WATER VAPOR BEING LIBERATED IN THE REACTION, AND SEPARATING THE RESULTING DIALDEHYDE PRODUCT FROM A MIXTURE.
Claim 4
Dependent Claim
111 words
A PROCESS FOR MAKING A DIALDEHYDE WHICH COMPRISES MIXING A 1,4-DIHYDROXYMETHYLATED BENZENE HYDROCARBON WITH ABOUT 0.1 TO 0.5 MOLE EQUIVALENTS OF AN ALKALI METAL HYDROXIDE AND ABOUT 1.1 TO 2 MOL EQUIVALENT OF A MONONITRATED HYDROCARBON OF THE CLASS CONSISTING OF BENZENE, TOLUENE, XYLENE AND NAPHTHALENE, ALSO ADDING TO THE REACTION MIXTURE ABOUT 2 TO 4 VOLUMES OF A WATERIMMISCIBLE INERT ENTRAINING AGENT HAVING A BOILING POINT BETWEEN ABOUT 50* AND ABOUT 150*C., HEATING THE RESULTING MIXTURE AT A TEMPERATURE BETWEEN ABOUT 100* AND 300*C. AND SUFFICIENT TO VAPORIZE THE ENTRAINER, WITHDRAWING VAPORIZED ENTRAINER AND WATER VAPOR BEING LIBERATED IN THE REACTION, AND SEPARATING THE RESULTING DIALDEHYDE PRODUCT FROM A MIXTURE.
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) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |