Patent US3564001A successfully refreshed from Google Patents.
US3564001A
Expired / Lapsed
US
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Method for production of benzotriazole
Assignee: PMC Inc
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Filing: 1968-02-19
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Granted: 1971-02-16
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Expires: 1988-02-19
Abstract
Abstract A METHOD FOR THE PREPARATION OF BENZOTRIAZOLE WHICH INVOLVES ACID TREATMENT OF BENZOTRIAZOLE REACTION MIXTURES COMBINED WITH SUBSEQUENT PURIFYING STEPS INCLUDING A DISTILLATION TO YIELD A PRODUCT OF HIGH QUALITY USEFUL IN THE PHOTOGRAPHIC INDUSTRY, YET WHICH IS RELATIVELY INEXPENSIVE TO MAKE WHEN COMPARED TO PRIOR ART PROCESSES.
Inventors
- 👤 John W Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:43
CPC Classifications
C; C07; C07D; C07D249/00; C07D249/16; C07D249/18
Claims Analysis
Total Claims: 0
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |