US2783276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of guanidine salts and substituted guanidine salts
Assignee: Wyeth Holdings LLC
•
Filing: 1955-11-22
•
Granted: 1957-02-26
•
Expires: 1975-11-22
Abstract
No abstract record available.
Inventors
- 👤 Leslie G Boatright
- 👤 Johnstone S Mackay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:24
CPC Classifications
C; C07; C07C; C07C277/00; C07C277/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A METHOD OF PREPARING GUANIDINE SALTS WHICH COMPRISES THE STEPS OF: FORMING A REACTANT MIXTURE COMPRISING AN INERT, INORGANIC, HEAT-STABLE POROUS ADSORBENT GEL, A UREA SELECTED FROM THE GROUP CONSISTING OF UREA, AND THE N-ALKYL AND N,N-DIALKYL UREAS WHEREIN THE ALKYL RADICALS CONTAIN 1-6 CARBON ATOMS A MEMBER OF THE GROUP CONSISTING OF THE NITRATE, PHOSPHATE, CHLORIDE, CITRIC, ACETATE AND OXALATE SALTS OF AMMONIA, THE RATIO OF THE WEIGHT OF ABSORBENT GEL TO THE TOTAL WEIGHT OF THE UREA PLUS THE AMMONIUM SALT RANGING FROM ABOUT 1:10 TO ABOUT 10:1, HEATING SAID REACTANT MIXTURE AT A TEMPERATURE OF FROM ABOUT 175*-300*C. FOR SUFFICIENT TIME TO FORM A GUANIDINE SALT, AND COLLECTING SO-FORMED GUANIDINE SALT.
Claim 2
Independent Claim
114 words
A METHOD OF PREPARING GUANIDINE SALTS WHICH COMPRISES THE STEPS OF: FORMING A REACTANT MIXTURE COMPRISING AN INERT, INORGANIC, HEAT-STABLE POROUS ADSORBENT GEL, A UREA SELECTED FROM THE GROUP CONSISTING OF UREA, AND THE N-ALKYL AND N,N-DIALKYL UREAS WHEREIN THE ALKYL RADICALS CONTAIN 1-6 CARBON ATOMS A MEMBER OF THE GROUP CONSISTING OF THE NITRATE, PHOSPHATE, CHLORIDE, CITRIC, ACETATE AND OXALATE SALTS OF AMMONIA, THE RATIO OF THE WEIGHT OF ABSORBENT GEL TO THE TOTAL WEIGHT OF THE UREA PLUS THE AMMONIUM SALT RANGING FROM ABOUT 1:10 TO ABOUT 10:1, HEATING SAID REACTANT MIXTURE AT A TEMPERATURE OF FROM ABOUT 175*-300*C. FOR SUFFICIENT TIME TO FORM A GUANIDINE SALT, AND COLLECTING SO-FORMED GUANIDINE SALT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-26 | 1960-08-27 | 1961-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-26 | 1964-08-27 | 1965-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-26 | 1968-08-27 | 1969-02-26 | $7700.00 | Window Closed / Lapsed |