Patent US2906774A successfully refreshed from Google Patents.
US2906774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of aromatic di- and polycarboxylic acids
Assignee: Henkel AG and Co KGaA
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Filing: 1957-05-23
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Granted: 1959-09-29
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Expires: 1977-05-23
Abstract
No abstract record available.
Inventors
- 👤 Raecke Bernhard
- 👤 Blaser Bruno
- 👤 Schirp Hubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:19
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/41; C07C51/416
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A PROCESS FOR THE MANUFACTURE OF SALTS OF BENEZENE POLYCARBOXYLIC ACIDS HAVING FROM TWO TO THREE CARBOXYL GROUPS ATTACHED IN ADJACENT IN POSITIONS ON THE BENEZENE NUCLEUS BY USING AS STARTING MATERIALS SALTS OF BENEZENE CARBOXYLIC ACIDS HAVING FROM ONE TO TWO CARBOXYL GROUPS, SAID STARTING MATERIAL ACID HAVING ONE LESS CARBOXYL GROUP THAN THE PRODUCT ACID, SAID SALTS BEING SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM, CALCIUM, STRONTIUM AND BARIUM SALTS WHICH COMPRISES HEATING SAID STARTING SALTS TO A TEMPERATURE ABOVE 300*F. AND BELOW THE TEMPERATURE AT WHICH SAID STARTING MATERIALS AND SAID PRODUCTS WILL SUBSTANTIALLY DECOMPOSE, IN A SUBSTANTIALLY OXYGEN FREE, INERT ATMOSPHERE, FOR A TIME SUFFICIENT TO FORM THE CORRESPONDING SALTS OF SAID PRODUCT ACID.
Claim 2
Dependent Claim
118 words
A PROCESS FOR THE MANUFACTURE OF SALTS OF BENEZENE POLYCARBOXYLIC ACIDS HAVING FROM TWO TO THREE CARBOXYL GROUPS ATTACHED IN ADJACENT IN POSITIONS ON THE BENEZENE NUCLEUS BY USING AS STARTING MATERIALS SALTS OF BENEZENE CARBOXYLIC ACIDS HAVING FROM ONE TO TWO CARBOXYL GROUPS, SAID STARTING MATERIAL ACID HAVING ONE LESS CARBOXYL GROUP THAN THE PRODUCT ACID, SAID SALTS BEING SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM, CALCIUM, STRONTIUM AND BARIUM SALTS WHICH COMPRISES HEATING SAID STARTING SALTS TO A TEMPERATURE ABOVE 300*F. AND BELOW THE TEMPERATURE AT WHICH SAID STARTING MATERIALS AND SAID PRODUCTS WILL SUBSTANTIALLY DECOMPOSE, IN A SUBSTANTIALLY OXYGEN FREE, INERT ATMOSPHERE, FOR A TIME SUFFICIENT TO FORM THE CORRESPONDING SALTS OF SAID PRODUCT ACID.
References Cited (Backward Citations)
GB747204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-28 | 1963-03-30 | 1963-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-28 | 1967-03-30 | 1967-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-28 | 1971-03-30 | 1971-09-29 | $7700.00 | Window Closed / Lapsed |