US3227726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of benzotriazole
Assignee: Universal Oil Products Co
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Filing: 1964-12-21
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Granted: 1966-01-04
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Expires: 1984-12-21
Abstract
No abstract record available.
Inventors
- 👤 Levy Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:54
CPC Classifications
C; C07; C07D; C07D249/00; C07D249/16; C07D249/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN THE METHOD OF PRODUCING A BENZOTRIAZOLE BY REACTING AN O-PHENYLENEDIAMINE WITH AN ALKALI METAL NITRITE IN AN AQUEOUS ACIDIC MEDIUM INTIALLY AT A LOW TEMPERATURE IN THE RANGE OF FROM ABOUT 0* TO 5*C., AND FINALLY AT A HIGHER TEMPERATURE ABOVE ABOUT 50*C., THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE REACTION ENTIRELY AT ELEVATED TEMPERATURE WITHIN-THE RANGE OF FROM ABOUT 50*C. TO ABOUT REFLUX AND IN AN AQUEOUS ACIDIC MEDIUM COMPRISING AN AQUEOUS SOLUTION OF AN ACID SELECTED FROM THE GROUP CONSISTING OF FORMIC, ACETIC AND PROPIONIC ACIDS AND SULFURIC ACID IN COMBINATION WITH AN ALKALI METAL SALT OF THE AFORESAID ORGAINC ACIDS.
Claim 2
Dependent Claim
104 words
IN THE METHOD OF PRODUCING A BENZOTRIAZOLE BY REACTING AN O-PHENYLENEDIAMINE WITH AN ALKALI METAL NITRITE IN AN AQUEOUS ACIDIC MEDIUM INTIALLY AT A LOW TEMPERATURE IN THE RANGE OF FROM ABOUT 0* TO 5*C., AND FINALLY AT A HIGHER TEMPERATURE ABOVE ABOUT 50*C., THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE REACTION ENTIRELY AT ELEVATED TEMPERATURE WITHIN-THE RANGE OF FROM ABOUT 50*C. TO ABOUT REFLUX AND IN AN AQUEOUS ACIDIC MEDIUM COMPRISING AN AQUEOUS SOLUTION OF AN ACID SELECTED FROM THE GROUP CONSISTING OF FORMIC, ACETIC AND PROPIONIC ACIDS AND SULFURIC ACID IN COMBINATION WITH AN ALKALI METAL SALT OF THE AFORESAID ORGAINC ACIDS.
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) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |