Patent US2663712A successfully refreshed from Google Patents.
US2663712A
Expired / Lapsed
US
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Hydroxy-benzimidazoles and method for their preparation
Assignee: GAF Chemicals Corp
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Filing: 1949-11-22
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Granted: 1953-12-22
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Expires: 1969-11-22
Abstract
No abstract record available.
Inventors
- 👤 Tulagin Vsevolod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:33
CPC Classifications
C; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/06; C07D235/08; C07D235/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
AN O-HYDROXYBENZIMIDAZOLE HAVING, IN THE FORM OF ITS FREE BASE, THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
13 words
AN O-HYDROXYBENZIMIDAZOLE HAVING, IN THE FORM OF ITS FREE BASE, THE FOLLOWING FORMULA:
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) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |