Patent US2262497A successfully refreshed from Google Patents.
US2849482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of naphthalene-2, 6-dicarboxylic acid
Assignee: Henkel AG and Co KGaA
•
Filing: 1956-11-19
•
Granted: 1958-08-26
•
Expires: 1976-11-19
Abstract
No abstract record available.
Inventors
- 👤 Raecke Bernhard
- 👤 Stein Werner
- 👤 Schirp Hubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:36
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/41; C07C51/412
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
THE PROCESS OF PRODUCING DIALKALI METAL SALTS OF NAPHTHALENE-2,6-DICARBOXYLIC ACID, WHICH COMPRISES HEATING A MATERIAL SELECTED FROM THE GROUP CONSISTING OF DIALKALI META SALT OF NAPHTHALIC ACID AND MIXTURES CONSISTING OF NAPHTHALIC ACID ANHYDRIDE AND AN ALKALI METAL CARBONATE, SAID MIXTURES FORMING DIALKALI METAL SALTS OF NAPHTHALIC ACID AT THE REACTION TEMPERATURE, IN A SUBSTANTIALLY OXYGEN-FREE, SUBSTANTIALLY ANHYDROUS INERT ATMOSPHERE TO A TEMPERATURE BETWEEN ABOUT 340*C. AND THE TEMPERATURE AT WHICH THE STARTING MATERIALS AND REACTION PRODUCTS BEGIN TO DECOMPOSE, UNTIL A SUBSTANTIAL AMOUNT OF THE STARTING MATERIAL HAS BEEN TRANSFORMED INTO THE CORRESPONDING DIALKALI METAL SALT OF NAPHTHALENE-2,6-DICARBOXYLIC ACID.
Claim 2
Dependent Claim
100 words
THE PROCESS OF PRODUCING DIALKALI METAL SALTS OF NAPHTHALENE-2,6-DICARBOXYLIC ACID, WHICH COMPRISES HEATING A MATERIAL SELECTED FROM THE GROUP CONSISTING OF DIALKALI META SALT OF NAPHTHALIC ACID AND MIXTURES CONSISTING OF NAPHTHALIC ACID ANHYDRIDE AND AN ALKALI METAL CARBONATE, SAID MIXTURES FORMING DIALKALI METAL SALTS OF NAPHTHALIC ACID AT THE REACTION TEMPERATURE, IN A SUBSTANTIALLY OXYGEN-FREE, SUBSTANTIALLY ANHYDROUS INERT ATMOSPHERE TO A TEMPERATURE BETWEEN ABOUT 340*C. AND THE TEMPERATURE AT WHICH THE STARTING MATERIALS AND REACTION PRODUCTS BEGIN TO DECOMPOSE, UNTIL A SUBSTANTIAL AMOUNT OF THE STARTING MATERIAL HAS BEEN TRANSFORMED INTO THE CORRESPONDING DIALKALI METAL SALT OF NAPHTHALENE-2,6-DICARBOXYLIC ACID.
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) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |