US3334054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of benzotriazole
Assignee: Geigy Co Ltd
•
Filing: 1964-07-27
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Granted: 1967-08-01
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Expires: 1984-07-27
Abstract
No abstract record available.
Inventors
- 👤 Howard Donald Kearey
- 👤 Popplewell Alan Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:04
CPC Classifications
C; C07; C07D; C07D249/00; C07D249/16; C07D249/18; C09; C09D; C09D5/00; C09D5/08; C09G; C09G1/00; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
A PROCESS FOR PRODUCING A WATER-MISCIBLE CONCENTRATED SOLUTION OF BENZOTRAZOLE FREE OF COLOR FORMING IMPURITIES, COMPRISING DISSOLVING BENZOTRIAZOLE IN A WATERMISCIBLE SOLVENT SELECTED FROM THE GROUP CONSISTING OF ETHYLENE GLYCOL, PROPYLENE GLYCOL, HEXYLENE GLYCOL, POLYETHYLENE GLYCOL, POLYPROPYLENE GLYCOL AND MIXTURES THEREOF, TO FORM A SOLUTION CONTAINING BENZOTRIAZOLE IN AN AMOUNT OF FROM 10% TO 40% BY WEIGHT AND TREATING THE RESULTING SOLUTION AT AN ELEVATED TEMPERATURE UP TO THE BOILING POINT OF THE SOLVENT WITH A DECOLORIZING MATERIAL SELECTED FROM THE GROUP CONSISTING OF ACTIVATED CHARCOAL, ACTIVATED CLAY, ACTIVATED ALUMINA, ACTIVATED BONE BLACK, KIESELGUHR, FULLER''S EARTH AND PUMICE.
References Cited (Backward Citations)
US2803603A
Cited
US2861078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |