US2966512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystallization of nu-alkyl guanidine salts
Assignee: Wyeth Holdings LLC
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Filing: 1958-01-29
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Granted: 1960-12-27
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Expires: 1978-01-29
Abstract
No abstract record available.
Inventors
- 👤 George N Gagliardi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:57
CPC Classifications
C; C07; C07C; C07C277/00; C07C277/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN CRYSTALLIZING N-DODECYLGUANIDINE ACETATE FROM REACTION LIQUORS IN WHICH THEY ARE COMPLETED SOLUBLE AT ABOVE ABOUT 50*C., THE IMPROVEMENT WHICH COMPRISES: ADJUSTING THE DISSOLVED ALKYL GUANIDINE SALT TO A DISSOLVED CONTENT OF FROM ABOUT 12 PERCENT TO ABOUT 18 PERCENT, ADDING TO THE SOLUTION A SUFFICIENT AMOUNT OF AN ACID CORRESPONDING TO THE ACID SALT BEING FORMED TO PRODUCE A FREE ACID CONTENT CORRESPONDING TO ABOUT PH 6 TO ABOUT PH 7, COOLING SO-TREATED LIQUOR TO ABOUT 50*C. AND THEREAFTER FURTHER REDUCING THE TEMPERATURE TO AMBIENT TEMPERATURES OF ABOUT 20 TO 25*C. AS RAPIDLY AS POSSIBLE WITHIN A PERIOD OF TIME NOT EXCEEDING ABOUT 5 HOURS, AND COLLECTING RESULTANT SEPARATING CRYSTALS.
Claim 2
Dependent Claim
111 words
IN CRYSTALLIZING N-DODECYLGUANIDINE ACETATE FROM REACTION LIQUORS IN WHICH THEY ARE COMPLETED SOLUBLE AT ABOVE ABOUT 50*C., THE IMPROVEMENT WHICH COMPRISES: ADJUSTING THE DISSOLVED ALKYL GUANIDINE SALT TO A DISSOLVED CONTENT OF FROM ABOUT 12 PERCENT TO ABOUT 18 PERCENT, ADDING TO THE SOLUTION A SUFFICIENT AMOUNT OF AN ACID CORRESPONDING TO THE ACID SALT BEING FORMED TO PRODUCE A FREE ACID CONTENT CORRESPONDING TO ABOUT PH 6 TO ABOUT PH 7, COOLING SO-TREATED LIQUOR TO ABOUT 50*C. AND THEREAFTER FURTHER REDUCING THE TEMPERATURE TO AMBIENT TEMPERATURES OF ABOUT 20 TO 25*C. AS RAPIDLY AS POSSIBLE WITHIN A PERIOD OF TIME NOT EXCEEDING ABOUT 5 HOURS, AND COLLECTING RESULTANT SEPARATING CRYSTALS.
References Cited (Backward Citations)
US2425341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-27 | 1964-06-27 | 1964-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-27 | 1968-06-27 | 1968-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-27 | 1972-06-27 | 1972-12-27 | $7700.00 | Window Closed / Lapsed |