Patent US2728776A successfully refreshed from Google Patents.
US2728776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternary ammonium compounds
Assignee: Bayer Pharma AG
•
Filing: 1953-07-22
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Granted: 1955-12-27
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Expires: 1973-07-22
Abstract
No abstract record available.
Inventors
- 👤 Schenck Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:46
CPC Classifications
C; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/06; C07D235/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A BENZIMIDAZOLE COMPOUND OF THE FOLLOWING FORMULA
Claim 2
Dependent Claim
7 words
A BENZIMIDAZOLE COMPOUND OF THE FOLLOWING FORMULA
References Cited (Backward Citations)
US2689853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |