US3270062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of crude aqueous glyoxal solutions
Assignee: BASF SE
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Filing: 1963-01-31
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Granted: 1966-08-30
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Expires: 1983-01-31
Abstract
No abstract record available.
Inventors
- 👤 Merz Wolfgang
- 👤 Nebe Erich
- 👤 Toussaint Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:11
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/27; C07C45/28; B; B01; B01J; B01J41/00; B01J41/04; C07C45/002; C07C45/78; C07C45/79
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A PROCESS FOR THE PURIFICATION OF CRUDE, COLORED, AQUEOUS SOLUTIONS OF GLYOXAL PRODUCED BY THE OXIDATION OF ACETALDEHYDE WITH AQUEOUS NITRIC ACID WHICH COMPRISES CONTACTING SAID SOLUTIONS WITH AN ANION EXCHANGE RESIN THE ION EXCHANGING GROUPS OF WHICH ARE SELECTED FROM AT LEAST ONE MEMBER OF THE CLASS CONSISTING OF TERTIARY AMINO GROUP AND QUATERNARY AMMONIUM GROUPS, SAID GROUPS BEING IN THE BICARBONATE SALT FORM AT A TEMPERATURE BETWEEN THE SETTING POINT OF SAID SOLUTION AND THE MAXIMUM WORKING TEMPERATURE OF SAID RESIN AND BELOW THE DECOMPOSITION TEMPRATURE OF SAID SOLUTION FOR A PERIOD OF TIME SUFFICIENT TO DECOLORIZED SAID SOLUTION.
Claim 2
Dependent Claim
101 words
A PROCESS FOR THE PURIFICATION OF CRUDE, COLORED, AQUEOUS SOLUTIONS OF GLYOXAL PRODUCED BY THE OXIDATION OF ACETALDEHYDE WITH AQUEOUS NITRIC ACID WHICH COMPRISES CONTACTING SAID SOLUTIONS WITH AN ANION EXCHANGE RESIN THE ION EXCHANGING GROUPS OF WHICH ARE SELECTED FROM AT LEAST ONE MEMBER OF THE CLASS CONSISTING OF TERTIARY AMINO GROUP AND QUATERNARY AMMONIUM GROUPS, SAID GROUPS BEING IN THE BICARBONATE SALT FORM AT A TEMPERATURE BETWEEN THE SETTING POINT OF SAID SOLUTION AND THE MAXIMUM WORKING TEMPERATURE OF SAID RESIN AND BELOW THE DECOMPOSITION TEMPRATURE OF SAID SOLUTION FOR A PERIOD OF TIME SUFFICIENT TO DECOLORIZED SAID SOLUTION.
References Cited (Backward Citations)
GB573051A
Cited
US3079985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |