Patent US2837489A successfully refreshed from Google Patents.
US2837489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of condensation products of carbohydrates, sulfurous acid or its derivatives, formaldehyde, and phenol
Assignee: BASF SE
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Filing: 1955-05-23
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Granted: 1958-06-03
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Expires: 1975-05-23
Abstract
No abstract record available.
Inventors
- 👤 Alles Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:34
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/18; C14C3/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A PROCESS OF MANUFACTURING A WATER-SOLUBLE TANNINLIKE CONDENSATION PRODUCT, WHICH COMPRISES CONDENSING BY HEATING TO A TEMPERATURE FROM ABOUT 50 TO 100*C. IN AQUEOUS ALKALINE MEDIUM FREE FROM ORGANIC COMPOUNDS HAVING SULFONIC ACID GROUPS A CARBOHYDRATE SELECTED FROM THE GROUP CONSISTING OF NATURAL AND SYNETHIC SUGARS, A COMPOUND SELECTED FROM THE CLASS CONSISTING OF SULFUROUS ACID AND ITS ATER-SOLUBLE SATLS, FORMALDEHYDE, AND A HYDROXYL COMPOUND OF THE BENZENE SERIES FREE FROM SULFONIC ACID GROUPS SELECTED FROM THE GROUP CONSISTING OF PHENOL, A LOWER ALKYL PHENOL, A CHLOROPHENOL AND A NITROCHLORO-PHENOL, THE MOLAR RATIO OF CARBOHYDRATE TO SULFUROUS COMPOUND BEING ABOUT 1:1 TO 1:2, THE MOLAR RATIO CARBOHYDRATE TO HYDROXYL COMPOUND BEING ABOUT 1:4 TO 1:14, RESPECTIVELY.
Claim 2
Dependent Claim
116 words
A PROCESS OF MANUFACTURING A WATER-SOLUBLE TANNINLIKE CONDENSATION PRODUCT, WHICH COMPRISES CONDENSING BY HEATING TO A TEMPERATURE FROM ABOUT 50 TO 100*C. IN AQUEOUS ALKALINE MEDIUM FREE FROM ORGANIC COMPOUNDS HAVING SULFONIC ACID GROUPS A CARBOHYDRATE SELECTED FROM THE GROUP CONSISTING OF NATURAL AND SYNETHIC SUGARS, A COMPOUND SELECTED FROM THE CLASS CONSISTING OF SULFUROUS ACID AND ITS ATER-SOLUBLE SATLS, FORMALDEHYDE, AND A HYDROXYL COMPOUND OF THE BENZENE SERIES FREE FROM SULFONIC ACID GROUPS SELECTED FROM THE GROUP CONSISTING OF PHENOL, A LOWER ALKYL PHENOL, A CHLOROPHENOL AND A NITROCHLORO-PHENOL, THE MOLAR RATIO OF CARBOHYDRATE TO SULFUROUS COMPOUND BEING ABOUT 1:1 TO 1:2, THE MOLAR RATIO CARBOHYDRATE TO HYDROXYL COMPOUND BEING ABOUT 1:4 TO 1:14, RESPECTIVELY.
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) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |