Patent US3153053A successfully refreshed from Google Patents.
US3153053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemistry of 6-chromanols
Assignee: Individual
•
Filing: 1963-01-17
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Granted: 1964-10-13
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Expires: 1983-01-17
Abstract
No abstract record available.
Inventors
- 👤 Charles D Robeson
- 👤 Donald R Nelan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:05
CPC Classifications
C; C11; C11B; C11B5/00; C11B5/0021; C11B5/0035; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/58; C07D311/70; C07D311/72; C07J; C07J75/00; C07J9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A PROCESS FOR PURIFYING A SUBSTANTALLY ANHYDROUS, CONCENTRATE OF A 6-CHROMANOL WHICH COMPRISES: ADMIXING WITH SAID CONCENTRATE A SUBSTANTIALLY ANHYDROUS CRYSTALLIZATION SOLVENT AND A PIPERAZINE COMPOUND SELECTED FROM THE GROUP CONSISTING OF PIPERAZINE AND C-METHYL AND C-ETHYL SUBSTITUTED PIPERAZINES, WHEREBY THEREIS FORMED A SOLUTION CONTAINING A COMPLEX OF SAID PIPERAZINE COMPOUND AND 6-CHROMANOL; CHANGING THE TEMPERATURE OF SAID SOLUTION TO A TEMPERATURE AT WHICH THE SOLUBILITY OF SAID COMPLEX IS SUBSTANTIALLY LESS, WHEREBY CRYSTALS OF SAID COMPLEX ARE FORMED; SEPARATING SAID CRYSTALS FROM SAID SOLUTION; ADMIXING SAID CRYSTALS WITH WATER, WHEREBY SAID COMPLEX DECOMPOSES TO SAID 6-CHROMANOL AND SAID PIPERAZINE COMPOUND; AND SEPARATING SAID 6-CHROMANOL FROM SAID WATER AND SAID PIPERAZINE COMPOUND.
Claim 2
Dependent Claim
112 words
A PROCESS FOR PURIFYING A SUBSTANTALLY ANHYDROUS, CONCENTRATE OF A 6-CHROMANOL WHICH COMPRISES: ADMIXING WITH SAID CONCENTRATE A SUBSTANTIALLY ANHYDROUS CRYSTALLIZATION SOLVENT AND A PIPERAZINE COMPOUND SELECTED FROM THE GROUP CONSISTING OF PIPERAZINE AND C-METHYL AND C-ETHYL SUBSTITUTED PIPERAZINES, WHEREBY THEREIS FORMED A SOLUTION CONTAINING A COMPLEX OF SAID PIPERAZINE COMPOUND AND 6-CHROMANOL; CHANGING THE TEMPERATURE OF SAID SOLUTION TO A TEMPERATURE AT WHICH THE SOLUBILITY OF SAID COMPLEX IS SUBSTANTIALLY LESS, WHEREBY CRYSTALS OF SAID COMPLEX ARE FORMED; SEPARATING SAID CRYSTALS FROM SAID SOLUTION; ADMIXING SAID CRYSTALS WITH WATER, WHEREBY SAID COMPLEX DECOMPOSES TO SAID 6-CHROMANOL AND SAID PIPERAZINE COMPOUND; AND SEPARATING SAID 6-CHROMANOL FROM SAID WATER AND SAID PIPERAZINE COMPOUND.
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) | 1967-10-13 | 1968-04-13 | 1968-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-13 | 1972-04-13 | 1972-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-13 | 1976-04-13 | 1976-10-13 | $7700.00 | Window Closed / Lapsed |