Patent US3004065A successfully refreshed from Google Patents.
US3004065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of alkylguanidine salts
Assignee: Wyeth Holdings LLC
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Filing: 1957-11-29
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Granted: 1961-10-10
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Expires: 1977-11-29
Abstract
No abstract record available.
Inventors
- 👤 George N Gagliardi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:57
CPC Classifications
C; C07; C07C; C07C277/00; C07C277/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
IN THE PREPARATION OF A SALT OF AN ALKYL GUANIDINE BY THE PROCESS WHICH COMPRISES FORMING A MIXTURE COMPRISING WATER, A PRIMARY ALKYL AMINE CONTAINING 10 OR MORE CARBON ATOMS AND AN ACID SALT OF SAID AMINE, ADDING THERETO A MIXTURE OF THE ACID CORRESPONDING TO SAID ACID SALT AND AN AQUEOUS SOLUTION OF CYANAMIDE, KEEPING THE RESULTANT MIXTURE AT A PH OF AT LEAST ABOUT NINE BY THE ADDITION OF SAID ACID CORRESPONDING TO SAID ACID SALT AND HOLDING THE TEMPERATURE OF THE MIXTURE BETWEEN ABOUT 95*C. AND 100*C. UNTIL REACTION SUBSTANTIALLY CEASES, THE IMPROVEMENT IN COMBINATION THEREWITH IN WHICH AN AQUEOUS CYANAMIDE SOLUTION HAVING A DISSOLVED IRON CONTENT OF LESS THAN 300 PARTS PER MILLION IS EMPLOYED AND SAID RESULTANT REACTION MIXTURE HAS, THROUGHOUT THE REACTION, A DISSOLVED IRON CONTENT OF LESS THAN ABOUT 100 PARTS PER MILLION.
Claim 2
Dependent Claim
140 words
IN THE PREPARATION OF A SALT OF AN ALKYL GUANIDINE BY THE PROCESS WHICH COMPRISES FORMING A MIXTURE COMPRISING WATER, A PRIMARY ALKYL AMINE CONTAINING 10 OR MORE CARBON ATOMS AND AN ACID SALT OF SAID AMINE, ADDING THERETO A MIXTURE OF THE ACID CORRESPONDING TO SAID ACID SALT AND AN AQUEOUS SOLUTION OF CYANAMIDE, KEEPING THE RESULTANT MIXTURE AT A PH OF AT LEAST ABOUT NINE BY THE ADDITION OF SAID ACID CORRESPONDING TO SAID ACID SALT AND HOLDING THE TEMPERATURE OF THE MIXTURE BETWEEN ABOUT 95*C. AND 100*C. UNTIL REACTION SUBSTANTIALLY CEASES, THE IMPROVEMENT IN COMBINATION THEREWITH IN WHICH AN AQUEOUS CYANAMIDE SOLUTION HAVING A DISSOLVED IRON CONTENT OF LESS THAN 300 PARTS PER MILLION IS EMPLOYED AND SAID RESULTANT REACTION MIXTURE HAS, THROUGHOUT THE REACTION, A DISSOLVED IRON CONTENT OF LESS THAN ABOUT 100 PARTS PER MILLION.
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) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |