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US2966514A
Expired / Lapsed
US
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Method of producing benzene polycarboxylic acid
Assignee: Bergwerksverband GmbH
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Filing: 1955-06-14
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Granted: 1960-12-27
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Expires: 1975-06-14
Abstract
No abstract record available.
Inventors
- 👤 Benning Anton
- 👤 Grosskinsky Otto
- 👤 Fruhbuss Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:06
CPC Classifications
F; F16; F16J; F16J1/00; F16J1/10; F16J1/14; F16J1/22; B; B22; B22D; B22D18/00; B22D18/02; B22D18/04; C; C07; C07C; C07C51/00; C07C51/16; C07C51/27; C07C51/275; C07C51/42; C07C51/48; C08; C08F; C08F10/00; C08F110/00; C08F110/02; Y; Y10; Y10S; Y10S260/00; Y10S260/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A METHOD OF PRODUCING BENZENE POLYCARBOXYLIC ACIDS, COMPRISING THE STEPS OF HEATING A BENZENE DERIVATIVE CONSISTING OF A BENZENE RING SUBSTITUTED WITH AT LEAST ONE SATURATED ALKYL GROUP CONTAINING LESS THAN 3 CARBON ATOMS AND WITH AT LEAST ONE CHLOROMETHYL GROUP WITH NITRIC ACID AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AT A TEMPERATURE SUFFICIENTLY HIGH TO OXIDIZE SAID CHLOROMETHYL GROUP UNTIL A SUBSTANTIALLY CHLORINE-FREE REACTION PRODUCT IS FORMED, THEREBY CONVERTING SAID CHLOROMETHYL GROUP TO A CARBOXYL GROUP WITHOUT SUBSTANTIALLY AFFECTING SAID ALKYL GROUP AND THUS FORMING AN ALKYL BENZENE CARBOLIC ACID, AND HEATING SAID CHLORINE-FREE REACTION PRODUCT WITH NITRIC ACID UNDER A SUPERATOMSPHERIC PRESSURE OF 3-30 ATMOSPHERES AT A TEMPERATURE SUFFICIENTLY HIGH TO OXIDIZE SAID ALKYL GROUP, THEREBY CONVERTING SAID ALKYL GROUP TO A CARBOXYL GROUP AND THUS OBTAINING A BENZENE CARBOXYLIC ACID CONSISTING OF A BENZENE RING SUBSTITUTED ONLY WITH CARBOXYL GROUPS.
Claim 2
Independent Claim
141 words
A METHOD OF PRODUCING BENZENE POLYCARBOXYLIC ACIDS, COMPRISING THE STEPS OF HEATING A BENZENE DERIVATIVE CONSISTING OF A BENZENE RING SUBSTITUTED WITH AT LEAST ONE SATURATED ALKYL GROUP CONTAINING LESS THAN 3 CARBON ATOMS AND WITH AT LEAST ONE CHLOROMETHYL GROUP WITH NITRIC ACID AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AT A TEMPERATURE SUFFICIENTLY HIGH TO OXIDIZE SAID CHLOROMETHYL GROUP UNTIL A SUBSTANTIALLY CHLORINE-FREE REACTION PRODUCT IS FORMED, THEREBY CONVERTING SAID CHLOROMETHYL GROUP TO A CARBOXYL GROUP WITHOUT SUBSTANTIALLY AFFECTING SAID ALKYL GROUP AND THUS FORMING AN ALKYL BENZENE CARBOLIC ACID, AND HEATING SAID CHLORINE-FREE REACTION PRODUCT WITH NITRIC ACID UNDER A SUPERATOMSPHERIC PRESSURE OF 3-30 ATMOSPHERES AT A TEMPERATURE SUFFICIENTLY HIGH TO OXIDIZE SAID ALKYL GROUP, THEREBY CONVERTING SAID ALKYL GROUP TO A CARBOXYL GROUP AND THUS OBTAINING A BENZENE CARBOXYLIC ACID CONSISTING OF A BENZENE RING SUBSTITUTED ONLY WITH CARBOXYL GROUPS.
References Cited (Backward Citations)
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Cited
US1332028A
Cited
US1576999A
Cited
GB698734A
Cited
US2636899A
Cited
BE517238A
Cited
US2740811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-27 | 1964-06-27 | 1964-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-27 | 1968-06-27 | 1968-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-27 | 1972-06-27 | 1972-12-27 | $7700.00 | Window Closed / Lapsed |