US3344183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2 n-substituted amino benzophenones
Assignee: F Hoffmann La Roche AG
•
Filing: 1965-10-22
•
Granted: 1967-09-26
•
Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Reeder Earl
- 👤 Sternbach Leo Henryk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:38
CPC Classifications
C; C07; C07D; C07D243/00; C07D243/06; C07D243/10; C07D243/14; C07D243/16; C07D243/18; C07D243/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
2 words
2-(N-LOWER ALKYL-P-TOLYSULFONAMIDO)-5,2''-DIHALOBENZOPHENONE.
References Cited (Backward Citations)
US1720751A
Cited
US3121103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |