Patent DE68208C successfully refreshed from Google Patents.
Patent US2952679A successfully refreshed from Google Patents.
US2952679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyanuricacro preparation
Assignee: —
•
Filing: —
•
Granted: 1960-09-13
•
Expires: 1977-09-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:10
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/30; C07D251/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
IN THE METHOD OF MAKING CYANURIC ACID BY PYROLYZING UREA IN AN INERT DILUENT IN A PYROLYSIS VESSEL AT A TEMPERATURE IN THE RANGE OF ABOUT 150-230*C. AND ATMOSPHERIC PRESSURE AND THEN WASHING THE DILUENT FROM THE CYANURIC ACID WITH WATER, THE IMPROVEMENT IN WHICH THE PYROLYSIS IS CARRIED OUT FOR A TIME NOT EXCEEDING ONE HOUR IN A DILUENT INITIALLY PREPARED BY HEATING TOGETHER UREA AND DIPROPYLENE GLYCOL IN A MOLE RATIO OF ABOUT 1:1 AT A TEMPERATURE OF 150-2000*C.
Claim 2
Dependent Claim
81 words
IN THE METHOD OF MAKING CYANURIC ACID BY PYROLYZING UREA IN AN INERT DILUENT IN A PYROLYSIS VESSEL AT A TEMPERATURE IN THE RANGE OF ABOUT 150-230*C. AND ATMOSPHERIC PRESSURE AND THEN WASHING THE DILUENT FROM THE CYANURIC ACID WITH WATER, THE IMPROVEMENT IN WHICH THE PYROLYSIS IS CARRIED OUT FOR A TIME NOT EXCEEDING ONE HOUR IN A DILUENT INITIALLY PREPARED BY HEATING TOGETHER UREA AND DIPROPYLENE GLYCOL IN A MOLE RATIO OF ABOUT 1:1 AT A TEMPERATURE OF 150-2000*C.
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) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |