Patent US2653977A successfully refreshed from Google Patents.
US2653977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chxnx
Assignee: —
•
Filing: —
•
Granted: 1953-09-29
•
Expires: 1970-09-29
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:28
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/12; C07D295/125; C07D295/13; C07C; C07C211/00; C07C211/01; C07C211/26; C07C211/29; C07C213/00; C07C213/08; C07C215/00; C07C215/02; C07C215/22; C07C215/28; C07C217/00; C07C217/02; C07C217/04; C07C217/06; C07C217/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF A FREE BASE AND ITS ACID ADDITION SALTS, SAID FREE BASE HAVING THE STRUCTURE
Claim 2
Dependent Claim
21 words
COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF A FREE BASE AND ITS ACID ADDITION SALTS, SAID FREE BASE HAVING THE STRUCTURE
References Cited (Backward Citations)
US2276618A
Cited
GB611476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-28 | 1957-03-30 | 1957-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-28 | 1961-03-30 | 1961-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-28 | 1965-03-30 | 1965-09-29 | $7700.00 | Window Closed / Lapsed |