US2820037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benzimidazobenzoisoquinolines
Assignee: GAF Chemicals Corp
•
Filing: 1956-05-24
•
Granted: 1958-01-14
•
Expires: 1976-05-24
Abstract
No abstract record available.
Inventors
- 👤 Schmidt-Nickels Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:52
CPC Classifications
C; C09; C09B; C09B57/00; C09B57/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A 4-SUBSTITUTED 1,8-NAPHTHOXYLENE-BENZIMIDAZOLE OF THE GENERAL FORMULA
Claim 2
Dependent Claim
7 words
A 4-SUBSTITUTED 1,8-NAPHTHOXYLENE-BENZIMIDAZOLE OF THE GENERAL FORMULA
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) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |